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Hello Good
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day so our topic is all about this is
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circuits episode 2 which is part 2 ng
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topic natin which is all about charge
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and current Okay so meron na tayong
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episode 1 part one for the same topic
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charge and current So kung hindi niyo pa
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napapanood is ni-link ko na lang sa
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description para alam niyo na yung
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concepts na di-discuss natin dito sa
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topic na charge and current so ito yung
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mga na-discuss natin doon sa part one
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Okay and then as promise magso-sorry
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number f
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Okay sige so mag-solve tayo ng more
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problems let's continue sulat ko muna
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problem number
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si the charge
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entering a
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certain
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element is
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shown
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below find the
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current
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at a time t = 1
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ah
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millisecond p time t qu 6 millisecond
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and c t 10 mise tapos meron tayong wave
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form ng charge
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versus
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time So you
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have 1 2 or Let's have 2 4 6 8
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10 12
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so 0 2 4 6 8 10
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12 14 yung time natin horizontal axis is
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in
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millisecond tapos ung yung vertical axis
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is yung charge Q of t measured in milc
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colum then meron tayong value na
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80 Okay so yung graph is
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ganito Okay so the charge entering a
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certain element is shown below find the
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current AT T A 1 MC b t6 m and CT 10 MC
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so given yung graph Paano natin
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hahanapin
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yung charge I mean Paano natin
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hanapin yung current I
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Okay kasi sa mga previous problem I'm
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given is ung equation nng charge right Q
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of t Paano kapag graph so apply pa rin
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natin ung formula or concept na ' ba
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yung current is derivative ng charge
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with respect to time Okay so at a t equ
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1
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mise So nasaan yung 1 millisecond dito
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sa sa horizontal axis dito Right ito ung
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one So ibig
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sabihin makukuha natin ung charge I mean
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ung current AT T is equ to 1 millisecond
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using this part of the graph Okay so
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Anong kukuhain natin doon sa graph yung
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slope Okay
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kasi yung current
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is time derivative nung Q with respect
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to or derivative ng Q with respect to t
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which is also the slope of the line for
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this portion of the graph Okay remember
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yyung derivative is the slope of the
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tangent line to the curve at a point so
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dahil given naman Iyung equation nung Q
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of t natin as a function of time ito
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Iyung graph niya ' ba So dito sa portion
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ng graph na which is just a line okay
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pag kinuhan natin yung slope nito yun na
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rin yung derivative or yun na rin ung
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current or derivative nung with respect
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to time or yung slope
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nung nung curve natin itong Q of t at a
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point where t is equ 1 m So ibig sabihin
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kukuh lang natin yung slope yun lang
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lagi okay So paano ba yung slope price
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over
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Run
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so delta Q bale over delta t
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so kuh natin yung mga end points nitong
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line so we have the origin for this
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point and then we have the coordinate
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2
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80 Okay so we can have q2 - q1 over t2 -
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T1 delta Q over delta
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t so given the point na ' tsaka ito
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let's say ito si q1 ah q2
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ah q2 Tapos T1 ah t2 I mean Tapos ito si
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T1 q1 Okay so plug in in the formula q2
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is
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80 -
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q1 0
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Okay divided by t2 which is
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2 yung
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coordinate Min T1 which
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is which is
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zero
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Okay so we have 80 - 0 That's just 80
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over 2 - 0 which is 2 so 80 / 2 that's
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40 okay
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so ang unit natin kasi dito is
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milli colum
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right tapos dito is
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millisecond so ma-cancel niya lang yung
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milli magiging colum per second
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or 40
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amps Okay so yung sagot sa part A is 40
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amps
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delete
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natin So this is 2
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80 next Dito naman sa part
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B AT T is equ 6 mise
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so Gan ulit check niyo muna kung saang
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portion ng
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gra malocate yung 6 m ba sa saan siyang
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por ng gra dito sa line na
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to
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Okay so yan yung kukuhaan natin ng slope
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so kapag horizontal
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line bale yung end points nitong line is
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28a b 10
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kama 80
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din Okay pag Kinuha mo yung slope niyan
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so current is again delta Q over delta t
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so let's say ito si 2 ito si t2 ito
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si q2 ito si
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T1
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q1 so q2 q2 - q1
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div by t2 - T1 so q2 is
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80 Min q1 is 80 pa rin
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right div t2 is
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10 min T1 is
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2 so 80 - 80 0 10 -
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2 8 so 0 / 8
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is z0 okay
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amps okay which makes sense kasi ' ba
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kapag horizontal line tayo sa analytic
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geometry natin Ano ba yung slope ng
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horizontal line zero right So kaya zero
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din dapat yung
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current wala ka kasing change sa Q ung
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tak mo is zero or yung rice is
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zero Okay next Dito naman sa c 10
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mise t is 10
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mise so Saang portion naman tayo ng
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graph titingin kung yung time is 10
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millisec ito si si time t 10 millisecond
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' ba e Dito siya sa graph na'to or sa
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part n graph na which is align Okay
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align pa rin so pag kinuhan natin yung
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slope niyan check niyo yung mga
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coordinates n end point so ito is 10 10
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10 80 Tapos ito is
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120 Okay so yung
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slan current is equ del q
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t q2 - q1 / t2 - T1 so let's say ito si
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ito si
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t2 Okay which is coordinate
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is T1 q1 t's ito I mean ito si si2 right
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so t2 q2 t's ito si 1 T1 q1
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nio yung slope so q2 - q1 or 0 -
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80 right so 0 - 80
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div t2 - T1 or 12 -
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10 so we have 0 -
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80 -80 div 12 - 10 that's 2 which is -
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80 di
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2 - 40 So amps So ibig sabihin yung
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current is - 40 so negative siya kasi
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yung slope nga is negative kasi ba kapag
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yung line natin is paganito yung
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orientation ang slope niyan is negative
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unlike pag ganito yung orientation line
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ang slope niya is positive kaya dito sa
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part A ang nakuhang slope is positive
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which is yung current na 40 amp Tapos
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ito sa C negative
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Okay Okay
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next
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number number
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7 the
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charge flowing
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in a
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wire is
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platted in the figure
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below
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sketch the
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corresponding
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current so meron tayong flat uli nung
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charge Q as a function of
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time so we have 0 2 4 6 8 10 so Iyung
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Time natin is in second t's we have 50
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dito - 50
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dito So this is the Q of
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t measured in column
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So yung graph is
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ganito parang hindi pantay yung line
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natin okay ganyan yung
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graph Okay so This is 02 4
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68 Okay Paano daw kapag given yung
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nung charge versus
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time As shown below As shown
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here sketch the corresponding current
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Okay sketch the corresponding current so
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apply pa rin natin yung concept ba
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yung na yung current is the
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derivative derivative ng
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Q with respect to time so pag pinat
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natin
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ngayon yung
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Cent Sige draw tayo
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ng
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another axis this
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time
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current versus time
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Okay so using the formula na yung
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current is the derivative n q with
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respect to time or siya yung slope right
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it is also the slope based sa previous
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problem
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din excuse so kuhain niyo lang yung
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for the same time interval let's say
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dito dito sa time interval na from 0 to
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2 so gayahin nio yung paghati
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Okay so This is 2 This
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is 4 This is 6 and this is
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8
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Okay so dito sa portion na to graph Q of
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Hanapin niyo yung slope ano yung slope
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nito which is Ito kasing point na is 250
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so for interval 0 to
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2 for 0 less
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than t l 2 ano yung current natin yung
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delta Q over delta t which is q2 - q1
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over t2 - T1 so ito
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yung natin
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250 then yung 1 is itong origin
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0,0 so q2 is
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50 Min q1 is
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0 div t2 is
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2 Min T1 is
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0 so 50 Min 0 is 50 div 2-0 2 or 25
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Okay so ang unit natin
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is kasi colum lang ' ' ba 50
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colum / 2 second so 50 / 2 25 colum per
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second or 25 amps so therefore ito yung
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fixed slope for the interval 0 to 2 Okay
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so ung current natin is 25 amps for this
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time in interval So from this interval
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from 0 to 2 fix yung current na let's
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say nandito na lang ito yung level nung
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25 amps Okay horizontal line siya
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Okay ito yyung corresponding graph
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next Okay so Dito
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naman dito sa interval na to
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Okay ano naman yung slope
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niyan so ito yung end point nung isa
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ta's ito ang coordinate niya is
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4,0 so kuhain yung
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slope for 2 l t l
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4 I is delta Q / delta
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t q2 - q1 / t2 - T1
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So yung point naman natin is 40 saka
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250
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Okay so ano yung ano natin diyan ano
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yung
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magiging
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slop so let's say ito si
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q2 si
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T1 si q1 si T1
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Sige kuhain natin yung point so
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40
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and
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2,50 so ito si
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q2
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t2
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Tapos ito si q1 ito si T1 so using the
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formula
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q2 is
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0 - q1 is 50 div
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t2 is
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4 -
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T1 is
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2 so 0 - 50 - 50 div 4 - 2 2 So that's -
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25 So saan naman yung ne
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25 so dito let's say - 25 so for this
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interval
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from 2 2 to 4 ang value n current is fix
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at nega
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25
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Okay
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next for this interval
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naman 4 to
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6 which is ang end point is 4,0 tsaka
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ano to
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6
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-50 Okay so kung ain yung slope so for
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interval 4 l t l
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6 so current is delta Q / delta
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t so q2 - q1 / t2 - T1 So ano ung mga
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point
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natin 6
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-50 t saka
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40 6 -50 and
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4,0 so ito si
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q2 t2 ito si q1
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T1 plugin
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q2 is -
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50 - q1 is 0 div t2 is
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6
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6 - T1 is
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4 so - 50 - 0 - 50 pa rin 6 - 4 2 which
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is - 50 / 2 that's - 25 amps pa rin so
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nandito pa rin siya sa same level for
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this
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interval 4 to 6 - 25 pa rin then last
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yung interval
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from 6 to 8 so ito yung end point nung
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line 6 -50 tapos ito
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is um 80
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so for 6 l t less
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8 so I is delta Q over delta t or q2 -
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q1 / t2 - T1 so ang gagamitin nating
00:24:14
point ngayon ay
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80 saka
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6-5 so
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80 and
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6
00:24:30
ne
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50 so let's say ito si
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t2 q2 ito si
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T1
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q1 so substitute dito we have q2 is 0 -
00:24:49
q1 is
00:24:51
-50 div t2 8 - T1
00:24:56
6 so negative of - 50 + 50 div 8 - 6
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which is
00:25:05
2 so 50 / 2 that's 25 amps so fix uli
00:25:12
constant current 25 for this interval 6
00:25:16
to 8 so dito
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siya Okay so therefore ito Iyung graph
00:25:22
nung
00:25:23
ating
00:25:25
current Okay kapag
00:25:29
Sige draw natin in
00:25:35
red
00:25:39
yan tapos
00:25:41
yan okay for the
00:25:44
given graph nitong charge versus time
00:25:48
ito yung magiging graph nung current
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Okay
00:26:01
next number
00:26:07
8 for number 8 the
00:26:14
current
00:26:17
flowing
00:26:20
pas a
00:26:23
point in a
00:26:27
device is
00:26:32
shown in Figure
00:26:41
below
00:26:45
Calculate the total
00:26:51
charge through the
00:26:55
point okay Meron tayong graph uli this
00:26:59
time current versus time
00:27:04
naman So
00:27:06
1
00:27:08
2 Time natin is in millisecond tapos
00:27:12
meron tayong current I in
00:27:16
milliamps So this is
00:27:19
10 then Iyung graph is ganito
00:27:35
Okay so the current flowing past a point
00:27:39
in a device is shown in Figure below so
00:27:42
ang graph ngayon natin is current versus
00:27:44
time shown here Calculate the total
00:27:48
charge so Paano kapag total charge ang
00:27:51
pinapahanap
00:27:53
so apply naman natin yung
00:27:56
formula na yung charge
00:28:00
is the integral of
00:28:03
idt from initial time t KN to final time
00:28:09
t plus whatever is the initial charge Q
00:28:14
AT T KN Okay so assuming itong Q of t KN
00:28:19
natin is
00:28:20
zer Okay so ito na lang yung gagamitin
00:28:23
nating formula kasi wala namang binigay
00:28:25
na initial charge AT T not right assume
00:28:29
natin na
00:28:30
zero so ang gagamitin nating formula na
00:28:33
lang is integral ng idt from t KN to t
00:28:38
So paano kapag given yung graph hindi
00:28:40
yung equation nung
00:28:43
current so apply natin yung concept na '
00:28:47
ba yung
00:28:48
integral application ng integral is the
00:28:51
area bounded by curves right So kung
00:28:54
i-in grr natin ' itong
00:28:58
graph na to from Bale ang initial time
00:29:01
is zer origin hanggang final time t So
00:29:06
yung T natin dito is
00:29:09
0 yung T natin is 2 so integrate natin
00:29:13
from 0 to 2 yung
00:29:16
idt which is yung i na to is represented
00:29:19
by the
00:29:21
graph so dahil yung integral from 0 to 2
00:29:26
ng idt is the same as
00:29:28
area area na' okay pag shade
00:29:44
natin pwede na lang nating applyan ng
00:29:48
geometric formula for the area nitong
00:29:51
shaded region espcially kung yung region
00:29:56
naman natin or yung figure is
00:30:00
um
00:30:02
ah tawag dito is pwedeng maapply yan ng
00:30:05
formula using yung mga geometric figure
00:30:08
right kasi Ano ba to this is Actually a
00:30:11
trapezoid
00:30:15
right So pwede nating gamitan ng formula
00:30:18
ng area for trapezoid which is Anong
00:30:21
area ng
00:30:23
trapezoid
00:30:25
1/2 times height times base 1 plus base
00:30:29
2 so ito yung base
00:30:32
1 ito yung base
00:30:36
2 Okay tapos yung height
00:30:41
ISO okay Kasi this is perpendicular
00:30:46
right Okay so makukuha agad natin yung
00:30:49
total
00:30:50
charge so total charge is 1/2
00:30:58
ano yung height natin So
00:31:01
that's 10 right ito yun
00:31:07
10 so 10 yung
00:31:10
height
00:31:12
times yung sum nung base 1 saka base 2
00:31:16
SAO yung base 1 Anong unit nito or ilan
00:31:20
yung length from 1 to 2 ibig sabihin How
00:31:25
many units 2 - 1 or 1 right So yung base
00:31:30
1 is 1
00:31:31
unit plus yung base two
00:31:35
ito
00:31:37
from 0 to 2 So that's 2 - 0 or 2 units
00:31:44
so yan yung base 2
00:31:47
natin So kapag kinompute natin to 1/2
00:31:51
Tim 10 that's 5 Tim 1 + 2 3 which is 5 3
00:32:00
or
00:32:01
15 Okay 15 Anong unit
00:32:05
natin kasi we have
00:32:08
milliamp and then we have
00:32:12
millisecond so kapag multiply
00:32:15
mo yung kasi ba Q is the product ng I
00:32:21
Tim
00:32:22
time So yung current mo is naka milliamp
00:32:28
tapos yung time mo is naka
00:32:30
millisecond that's milli Tim milli 10
00:32:35
to3 Tim 10
00:32:38
to3 that's
00:32:41
106 right ang unit amp second
00:32:46
is charge Okay so 10 to 6 colum which is
00:32:51
kapag ginamitan mo ng prefix yung 10 to
00:32:56
6 micro y
00:32:59
right so ang total charge is 15 micr
00:33:05
colum Okay
00:33:07
using formula for the area n trap Pero
00:33:11
in case na na yung equation or yung
00:33:14
graph nung current natin is hindi
00:33:17
regular regular shape halimbawa ah let's
00:33:21
say yung graph is naging ganito Okay yan
00:33:26
yung gagamitan niyo ngayon ng integral
00:33:29
okay pag irregular ung shape nung graph
00:33:33
Pero kapag mga regular shape naman like
00:33:35
trapezoid rectangle square triangle
00:33:39
Pwede niyo na lang gamitan ng formula
00:33:41
for the area para mas
00:33:44
madala
00:33:45
Okay
00:33:51
next number
00:33:55
nine so gann uli
00:34:01
f or sulat ko
00:34:09
muna the
00:34:12
current through an
00:34:15
element is
00:34:18
shown
00:34:23
below determine
00:34:28
the total
00:34:30
[Musika]
00:34:34
charge that
00:34:37
passed
00:34:40
through the element
00:34:44
at so meron tayong tatlong case at t equ
00:34:49
1 second B AT T equ 3 second C AT
00:34:55
T 5 second Eto yung
00:35:17
[Musika]
00:35:25
graph na lang
00:35:36
So this is 5 This is
00:35:42
10 tapos 1 2
00:35:46
3 4 5 6 so time is measured in
00:35:53
second current is measured in
00:35:56
amps so
00:36:02
10
00:36:07
2
00:36:09
4 5 1 2 3 4 ah mala mala mala
00:36:21
mala 4 f
00:36:24
[Musika]
00:36:28
ito yung
00:36:30
f ito yung five Okay tapos This Is
00:36:38
Zero so determine the current or the
00:36:42
current through an element is shown
00:36:44
below again graph uli nung current
00:36:46
versus time determine the total charge
00:36:50
that pass through the element so charge
00:36:52
uli
00:36:54
At Time a for a time t is 1 second So
00:36:59
ibig sabihin hanggang ano lang tayo from
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zer to 1 Okay 1 second So ano lang yung
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graph natin
00:37:09
diyan Ito lang Okay so Yan lang yung
00:37:13
hahanapan natin ng area kasi charge uli
00:37:18
yung hinahanap ' ba Pag charge is yung
00:37:20
area under the
00:37:22
curve so for a total charge is So anong
00:37:28
area nito area which is
00:37:33
rectangle length times wid lang okay
00:37:37
yung length is
00:37:39
ito which is 10
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units so 10
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amps di ba 10 amps times the
00:37:52
Wi which is 1 unit from 1 Ah from zer to
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1 1 Unit 1
00:38:01
second Okay so that's 10 amps Tim 1
00:38:05
second
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or 10
00:38:12
colum for part
00:38:16
B T is 3 seconds naman So from 0 to 3 So
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ano yung graph natin
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hanggang
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dito hanggang dito
00:38:37
Okay so shadan natin lahat nung
00:38:42
area enclosed from time 0 to time t equ
00:38:49
3
00:38:51
Okay
00:38:54
so dagdag na lang natin onong area na
00:38:58
to dito sa area nung rectangle kasi
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Kasama rin to ' ba So
00:39:05
4b Q is so automatic kasama na to yyung
00:39:10
area na 10 which is equivalent to 10
00:39:14
colum right plus ito
00:39:18
pa so hatiin natin into 2
00:39:23
pwedeng ito muna
00:39:27
1 tapos
00:39:29
q2 so dito sa q2 q1 That's a trapezoid
00:39:35
right so
00:39:37
1/2
00:39:39
height B1
00:39:42
B2 So ano yung height ito yung height
00:39:46
yung
00:39:47
perpendicular right which is 2
00:39:52
2-1 1 unit okay
00:39:57
So this is 1 unit times yung b1 let's
00:40:03
say ito yung
00:40:04
b1 which is
00:40:07
10 Okay
00:40:09
10
00:40:12
units plus yung
00:40:16
B2 it
00:40:18
naman which is
00:40:21
5 5 units
00:40:25
right Plus
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5 Okay ito yung q1 plus ito namang
00:40:36
q2 ano lang siya
00:40:41
rectangle length
00:40:43
Tim ano yung
00:40:46
length length natin is
00:40:49
Ito ba 5
00:40:54
units so
00:40:56
5 times the wid yyung wid naman is yung
00:41:00
mas maliit
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ito which is from 2 to 3 or 3 - 2
00:41:07
1 1
00:41:10
unit so bale Meron tayong 10 colum plus
00:41:15
So ilan
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to
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1/2 1/2 ng 10 +
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5
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15 15 / 2
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7.5 colum + 5 *
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1
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5 so 10 colum + 7.5 colum + 5 colum
00:41:46
22.5
00:41:49
colum okay last ung
00:41:54
c c is AT T is equal to 5
00:41:59
seconds so
00:42:00
hanggang 5 na from 0 to 5 yung region or
00:42:05
yung area natin So shsh na natin
00:42:12
lahat okay so bale kasama na agad
00:42:16
to yung area from 0 to 3 which is
00:42:21
nacompute na
00:42:23
natin sa part B 22
00:42:29
22.5 right So yung total charge is
00:42:33
kasama na agad to 22.5 colum plus yung
00:42:39
added area na lang na to let's say
00:42:42
q3 which is a trapezoid
00:42:45
uli Okay so area is 1/2 he Tim b1 plus
00:42:52
B2 So ano yung height yung height is ito
00:42:57
uli which is yung
00:43:01
perpendicular
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Okay which is 5 units right 5 units
00:43:07
Iyung
00:43:09
height so Iyung height is 5 units
00:43:13
substitute ano Iyung
00:43:15
b1 yung b1 let's say ito na
00:43:21
lang So that's
00:43:23
from from 4 to 3 right How many units
00:43:29
yon 4 -
00:43:31
3 1 unit Okay 1 unit lang to let's say
00:43:35
ito yung
00:43:37
b1 so 1 unit plus yung B2 ano yung B2
00:43:44
ito na yung baba
00:43:48
right So from 3 to 5 how many length How
00:43:53
many units is the length 5 - 3 2
00:43:59
so bale q equ
00:44:03
22.5 plus so
00:44:06
1/2
00:44:08
5 or
00:44:11
2.5
00:44:12
Tim 1 +
00:44:15
2
00:44:18
3
00:44:21
right So this is 2.5 3
00:44:27
Ilan
00:44:31
yon 15 kasi 15 / 2 yan '
00:44:36
ba
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7.5 So 22.5 + 7.5 colum eksakto na to na
00:44:52
30 30
00:44:54
colum so yan yung sagot sa sa part
00:45:02
C Okay
00:45:06
yan so again kung yung figure natin na
00:45:09
is hindi regular Tulad nito Nagkataon
00:45:13
kasi na yung graph nung ating current is
00:45:17
P Kinawa natin yung mga area mga mga
00:45:20
regular shape right
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rectangle saka trapezoid
00:45:27
kaya ginamitan na lang natin ng mga
00:45:29
formula ng area for geometric figure
00:45:31
Pero kapag irregular let's say ganito
00:45:34
curve I integrate niyo Okay gamit yung
00:45:37
formula na charge Q is integral ng idt
00:45:43
from t not to
00:45:49
t Okay so i think hanggang dito na lang
00:45:52
muna yung discussion natin for this to
00:45:56
peak charge and current so Siguro next
00:46:02
time di-discuss naman natin is voltage
00:46:07
energy and Power Okay so isa-isahin
00:46:12
natin yung mga definition nung
00:46:15
ah mga
00:46:17
terminologies na gagamitin natin dito sa
00:46:22
DC circuit subject okay yung mga current
00:46:26
voltage
00:46:27
charge energy power
00:46:30
etc so y so end ko na yung ating ating
00:46:34
video tutorial for this topic and see
00:46:38
you sa next live natin