![]() ![]() To find a resistor value: (5V - Vf)/.02A = lowest resistor value to use, higher is ok.Įxample Vf = 2.2V for a typical Red LED: (5V - 2.2V)/.02A = 140 ohm, use a 150ohm standard value resistor. LEDs have a forward voltage, Vf, that is the voltage you will measure across the leads when it starts to conduct.
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