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Thread: Fun With Electricity

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  1. Apr 26th, 2012, 02:47 PM #11
    CVMichael
    CVMichael is offline
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    Re: Fun With Electricity

    It's strange... I always thought that a resistor resists the current, the voltage stays the same.

    The voltage goes down when it is in series with another resistor that is connected to power.
    For example: + Volts -> resistance 1 -> (measure here) -> resistance 2 -> ground.

    So at the point "measure here" you will have less voltage, depending on the values of both resistors.

    [Edit]
    Something to add to that: Every single device (regardless what it is) it has a resistance, including the LED...
    So, in your example the voltage goes down because of the resistance of the LED is in serries with your 220 ohm resistor.
    Last edited by CVMichael; Apr 26th, 2012 at 02:55 PM.
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