How AC is turned to DC! EASY! (Rectifiers): Electronics Basics 7

00:05:35
https://www.youtube.com/watch?v=5cbQNfO0Mwg

Ringkasan

TLDRThis video explains the basics of rectifier circuits for those new to electronics. A rectifier converts AC (alternating current) into DC (direct current) using diodes, which only allow current to flow in one direction. This conversion is crucial for most electronic devices, which require DC to operate. The video demonstrates a simple rectifier using four diodes to change AC to DC, showing how current flows through the diodes and LEDs. It also highlights the role of resistors in reducing current and ensuring the circuit functions smoothly. This type of rectifier is commonly found in power supplies to convert AC from electrical outlets to DC to power devices.

Takeaways

  • 🔌 A rectifier converts AC to DC using diodes.
  • 💡 Diodes allow current to flow in only one direction.
  • 🔄 AC is like a two-way street, while DC is a one-way street.
  • 🔧 Rectifiers are crucial in power supplies.
  • 💡 LEDs flash erratically on AC without rectification.
  • ⚡ Diode arrangement controls current direction.
  • 🌀 AC waves alternate direction.
  • 🔍 Flow of electrons shows rectification process.
  • 🎛️ Resistors help reduce current flow.
  • ⚙️ Simple rectifiers use four diodes.

Garis waktu

  • 00:00:00 - 00:05:35

    The video begins by introducing a circuit that may seem complex at first, but is actually a straightforward rectifier. A rectifier is explained as a component that converts AC (alternating current) into DC (direct current). This transformation is illustrated by showing the motion of electrons; in AC, electrons move back and forth, whereas in DC, they move in one constant direction. The key to this conversion is the use of diodes, which allow current to pass in only one direction. This mechanism is crucial for electronic devices that rely on a constant DC power supply. The video emphasizes that diodes are a common feature in circuits, particularly in power supplies that convert AC to DC. The specific example provided involves an AC power supply running at 240 volts AC, 60 Hz, passing through a resistor to limit current powering LEDs. The essential function of the diodes in the rectifier circuit is highlighted, showing how they guide the electrons to flow in one direction only, regardless of the alternating nature of the source. This results in the LEDs being powered by a DC supply, avoiding the potential flickering that would occur if they were powered directly by AC.

Peta Pikiran

Video Tanya Jawab

  • What is a rectifier?

    A rectifier is a circuit that converts AC (alternating current) into DC (direct current) using diodes.

  • How does a diode work in a rectifier circuit?

    A diode allows current to flow in only one direction, which helps convert AC to DC.

  • Why is it important to convert AC to DC?

    Most electronic devices require DC to function, so converting AC (from outlets) to DC is essential.

  • How does the diode arrangement affect current flow?

    The diode arrangement ensures that the AC current flows as DC by allowing current flow only in one direction on each wave.

  • What happens if LEDs are powered by AC?

    The LEDs would flash and appear erratic if powered directly by AC instead of DC.

  • What is the role of the resistor in the circuit?

    In this simplified circuit, the resistor is used to reduce the current to a suitable level for the LEDs.

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Gulir Otomatis:
  • 00:00:00
    if you are relatively new to electronics
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    don't freak out just yet this circuit
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    might look a bit crazy but I promise you
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    it is simpler than it looks what you are
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    looking at here is basically a rectifier
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    so what is a rectifier what does it do
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    well if I slow down time here just a
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    little bit a rectifier will turn an AC
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    power source as you can see
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    here with a back and forth motion of
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    electrons in into a DC power source
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    where if you look here the electrons are
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    moving forward in One Direction only
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    through the LEDs in Only One
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    Direction and that is due to the magical
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    wonders of diodes this is one of the
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    most useful ways of using diodes in any
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    circuit and you'll find them in pretty
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    much every single circuit you look at
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    and especially power supplies um because
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    power supplies like the transformer that
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    you plug into the AC socket that is what
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    is responsible for turning alternating
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    current into direct current to power
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    your devices so if we look at the
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    circuit here I've basically got an AC
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    power supply so it's running at 240
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    volts ac at 60 HZ or pulsing back and
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    forth 60 times a second and and I'm
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    running it through a resistor not
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    something you would normally do but for
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    the sake of Simplicity I'm using the
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    resistor to reduce the current um just
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    enough to power these
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    LEDs the only thing turning this
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    alternating
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    current into direct current are these
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    four diodes now if you look at the way
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    that they are
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    arranged you might be able to see what's
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    happening here so here we are I've
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    actually slowed it down into Super super
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    slow motion so that you can actually see
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    the operation because a diode will only
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    allow current to flow in One Direction
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    that means I
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    can basically make the alternating
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    current flow through all of these
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    diodes in a way that when the electrons
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    actually flow out to the rest of the
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    circuit they're always flowing in One
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    Direction but you can see they they are
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    not alternating back and forth they are
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    simply going straight forward in One
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    Direction with very small pauses as the
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    AC Supply hits zero on the wave and so
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    that means I can power these LEDs
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    because if there were actually being
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    powered from alternating current these
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    LEDs would be flashing and uh would look
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    absolutely horrendous now the easiest
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    way to see how this is working is by
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    following the flow of electrons so I'm
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    going to slow this down even more so we
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    can follow the electrons even easier we
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    can actually follow the electrons on
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    each part of the wave to see what's
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    happening as the electrons are now about
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    to move uh the other way Watch What
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    Happens so here we go the electrons will
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    start moving this way
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    and it won't pass through this diode
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    because this diode uh is in the
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    Direction which will not allow current
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    to flow so instead the current now flows
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    through here and through this diode
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    pushing all the electrons up
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    here and as the current starts to change
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    now you can see that it's flowing
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    through this diode and again going up in
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    this
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    direction so that means on each half of
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    the AC wave the electrons are being
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    pushed in that One Direction because
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    only one diode here will allow current
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    to flow on each alternating wave and the
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    same happens on the returning end as
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    well so we've followed it from this side
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    and there are another two diodes to
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    obviously complete the circuit which
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    means that when current flows backwards
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    this way it goes all the way up here
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    round to the LEDs through the LEDs and
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    back through this diode and back to the
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    AC power supply and when the current
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    starts to flip the other
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    way you can see it goes in this
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    Direction all the way up here through
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    the LEDs and returns to the AC power
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    supply in this direction so in effect
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    that really useful property of diodes
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    that allows current to flow in only One
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    Direction um means that we can place the
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    diodes in a particular way that
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    alternating
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    current can be changed into direct
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    current to power devices which can only
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    run or run more efficiently on direct
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    current and so this is actually a very
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    simplified version of what you would
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    find in in pretty much any power supply
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    that converts alternating current from
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    your home electrical supply to direct
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    current to power your devices
Tags
  • rectifier
  • AC
  • DC
  • diodes
  • electronic circuit
  • power supply
  • LEDs
  • current flow
  • resistor
  • electricity