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whats up asked Do I need to include a resistor when I hook up a single 3 volt led to a 3volt power supply?
The power supply is an AA battery enclosure with 2 batteries, each battery is 1.5volts. My led is a single, red 3 mm, low intensity, led, rated for 3 volts with a 15ma current.
And got the following answer:
Hi "WhatsUp": A resistor is used with LEDs as a current-limiting device. Using E=IR, you should use a 200 Ohm resistor in series with the LED to limit the current draw to 15milliAmps. hope this helps, --Dennis C.