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Will this a 12VDC 1A Adapter break my LED?

Discussion in 'LEDs and Optoelectronics' started by DiamondsareMine, Jul 21, 2015.

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  1. DiamondsareMine


    Jul 19, 2015
    Noob question: I have a red LED that runs at 12 VDC max and 20mA with a integrated resistor. Does the 1A on the adapter mean that it is capable of bringing up to 1A on a device or it will it burn out my LED when I wire the Adapter onto my LED?
  2. Colin Mitchell

    Colin Mitchell

    Aug 31, 2014
    The LED and resistor will only take 20mA, even if the adapter is capable of delivering 5 amps.
    It is the resistor that limits the current to 20mA
  3. DiamondsareMine


    Jul 19, 2015
    I totally forgot about the properties of a resistor. Thanks!
  4. Gryd3


    Jun 25, 2014
    I'll add on to this.
    The property of the resistor is entirely dependant on the supplied voltage!
    If the voltage goes up, so too will the current which equals a damaged LED.
    If you need to use a higher voltage, replace the resistor, or add an additional resistor in series ;)
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