Resistors in Series and Parallel Circuits Experiment - GCSE Physics Required Practical

00:03:52
https://www.youtube.com/watch?v=wer2-FK1pIA

摘要

TLDRThe video presents an experiment focused on measuring electrical resistance in both series and parallel configurations using resistors. Initially, two identical resistors are tested individually within a simple circuit that includes an ammeter and a voltmeter. After obtaining readings of current and voltage, the resistance for each resistor is calculated. The experiment then moves on to connect the resistors in series, observing changes in current and voltage, followed by a parallel configuration that results in higher current readings due to the alternative pathways for current flow. The final objective is to determine the total resistance for both configurations.

心得

  • 🔌 The experiment measures resistor resistance.
  • 📊 Individual and combined resistance readings are taken.
  • ⚡ Current readings fluctuate based on configuration.
  • 📏 Ohm's law is used to calculate resistance.
  • 🔄 Resistors in series increase total resistance.
  • 🔋 Resistors in parallel higher total current.
  • 🔍 Observations depend on connection type.
  • 🛠️ Careful wiring is critical during experiments.
  • 📚 Knowledge of circuits helps in calculations.
  • 💡 Adjust current settings for safe measurements.

时间轴

  • 00:00:00 - 00:03:52

    The experiment involves measuring the resistance of identical resistors connected in both series and parallel configurations. Initially, a simple circuit is set up using two cells (limited to a maximum of four volts) along with an ammeter and voltmeter. After ensuring that the circuit is functioning properly with the first resistor, current and voltage readings are obtained: 0.26-0.27 amps and 2.68 volts respectively, allowing for a resistance calculation. This process is repeated with a second resistor yielding similar readings, confirming their values. Next, the resistors are connected in series, leading to a new set of readings indicating total resistance. Lastly, the resistors are arranged in parallel, resulting in higher current and a combined voltage of 2.46 volts and current measurements of 0.47-0.48 amps, allowing for the calculation of their combined resistance in this configuration.

思维导图

视频问答

  • What is the purpose of the experiment?

    To measure the resistance of resistors in series and parallel.

  • What equipment is used in this experiment?

    Resistors, ammeter, voltmeter, and power supply.

  • How do you measure resistance?

    By obtaining current and voltage readings and applying Ohm's law.

  • What happens to current when resistors are in parallel?

    The current increases because there are multiple paths for it to flow.

  • What are the expected readings for resistors in series?

    The total resistance should increase compared to individual resistors.

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  • 00:00:02
    so in this experiment we're going to be
  • 00:00:04
    measuring the resistance
  • 00:00:05
    of resistors both in series and also
  • 00:00:08
    parallel so i've got a couple of
  • 00:00:10
    resistors here these ones are identical
  • 00:00:12
    and i've just covered up the value of
  • 00:00:14
    these resistances so we can actually
  • 00:00:16
    work that out in the experiment
  • 00:00:18
    now the first thing we're going to do is
  • 00:00:19
    we're going to connect it into a very
  • 00:00:20
    simple circuit
  • 00:00:22
    i've got my cells here i'm actually
  • 00:00:24
    going to be using just
  • 00:00:26
    two of them because we're going to go up
  • 00:00:27
    to a maximum
  • 00:00:29
    and it says on here a maximum of four
  • 00:00:31
    volts so i'm just going to use
  • 00:00:32
    two of these um and we've got an ammeter
  • 00:00:35
    and a voltmeter
  • 00:00:36
    so the first thing i'm going to do is
  • 00:00:37
    just connect one of these resistors
  • 00:00:40
    um into the circuit and i'm going to put
  • 00:00:42
    it just
  • 00:00:44
    with the ammeter and this allows me to
  • 00:00:46
    check that the ammeter is working
  • 00:00:48
    that all of the wires are working and
  • 00:00:50
    that this resistor is working
  • 00:00:52
    as well so we can see when i do that
  • 00:00:56
    that we've got a value of 0.26 or
  • 00:00:59
    27 amps okay so we know that the circuit
  • 00:01:03
    is working so far
  • 00:01:04
    and what i'm then going to do is i'm
  • 00:01:06
    going to connect my voltmeter
  • 00:01:08
    in parallel to the resistor
  • 00:01:12
    and this gives a reading of 2.68
  • 00:01:16
    volts okay so we've got the current
  • 00:01:18
    we've got the potential difference of
  • 00:01:20
    the voltage
  • 00:01:20
    and that means we can now calculate the
  • 00:01:23
    resistance
  • 00:01:24
    of this resistor so if you want to take
  • 00:01:26
    a record of these readings now
  • 00:01:31
    i'm then going to take this resistor out
  • 00:01:34
    and i'm going to replace it with the
  • 00:01:37
    other resistor
  • 00:01:38
    now this is the same value so these
  • 00:01:40
    readings should be similar
  • 00:01:43
    and we can see that this one is
  • 00:01:44
    fluctuating between 2 4 and 2 5. so
  • 00:01:47
    it's really your judgment about which
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    value you use so
  • 00:01:51
    we've now worked out the resistance of
  • 00:01:53
    these two individual resistors we're now
  • 00:01:55
    going to see what happens when we
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    connect them
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    in series so to do that
  • 00:02:00
    just to make sure that i don't get
  • 00:02:02
    confused with the wires
  • 00:02:04
    if i just take the voltmeter out what
  • 00:02:07
    i'm now going to do
  • 00:02:08
    is just put the two resistors like this
  • 00:02:12
    i'm going to connect them up with this
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    wire and once again
  • 00:02:16
    now they're in series we can see there's
  • 00:02:18
    a reading on the ammeter
  • 00:02:20
    and if i put the voltmeter in parallel
  • 00:02:23
    this is the reading that we're going to
  • 00:02:25
    take
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    so what you can now do is you can look
  • 00:02:32
    at the total resistance of this
  • 00:02:34
    combination of resistors
  • 00:02:36
    in series now the last thing we're going
  • 00:02:38
    to be doing is looking at resistors
  • 00:02:41
    in parallel so again once again i'm
  • 00:02:43
    going to take the voltmeter out
  • 00:02:45
    i'm just going to disconnect the
  • 00:02:46
    resistors
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    and now i'm going to connect them up in
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    parallel
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    so it's just worth taking care keeping
  • 00:02:54
    an eye of where
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    all of the wires go so we can see now we
  • 00:02:58
    have a higher current
  • 00:03:00
    because we've got these in parallel and
  • 00:03:02
    i'm just going to put
  • 00:03:03
    this across the terminals here
  • 00:03:06
    okay so now we've got
  • 00:03:10
    2.46 volts and that's going to be across
  • 00:03:12
    both
  • 00:03:13
    of these and we've got a current of 0.47
  • 00:03:17
    or four eight
  • 00:03:18
    so we've now got readings for the
  • 00:03:21
    current
  • 00:03:22
    and the voltage and we can now look at
  • 00:03:23
    the total combined resistance
  • 00:03:26
    of this combination of resistors in
  • 00:03:30
    parallel
  • 00:03:52
    you
标签
  • resistance
  • series
  • parallel
  • experiment
  • ammeter
  • voltmeter
  • current
  • voltage
  • Ohm's law
  • circuit