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What Resistor Do I use with my LED Answered

I have a 9 volt 17 watt power supply going to an old game system and I am adding an extra 5 volt LED to it so what resistor should I use to power my 5 volt LED?

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11010010110
11010010110

12 years ago

here. the solution with the less parallel links (usually solution 0) is the most efficient