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oHow to light up a led? Answered

how do i light up a led .

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Bot1398
Bot1398

Best Answer 9 years ago

Connect the longer end of the LED to the +ve terminal of the battery and the shorter pin to the -ve terminal via a resistor if you are using a 9V battery a 1K resistor is fine.

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bwrussell
bwrussell

9 years ago

Ohm's Law -> R = V/I. Input the voltage of you DC power source, divide by .02 A (20mA), that will tell you the resistor size you need in Ohms. Then wire everything in series end to end).

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verence
verence

9 years ago

Force a current of about 20mA through it.

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rickharris
rickharris

9 years ago

Add electricity - Don't forget a resistor - the shorter leg is the negative side. Look at the related column on the right >>>>>>>>>>