To be on the safe side we generally select the next higher value that we have on hand. Resistor for led 12v. Resistor Requirement For 3 3v Electrical Engineering Stack Solved Problem 1 The Current Voltage Curve Of A Small Ye Led Resistor Calculator For a typical white led that requires 10ma powered by 12v the values are. Resistor value led 12v . Resistor battery voltage led voltage desired led current. But thats okay because well be using a resistor with a 5 tolerance so it wont necessarily be exactly that value anyway. Can i just multiply the value for each of the led resistor values i get. For 12 volts this usually works out to be a 470 ohm resistor which is the value i use for my led light chaser strings. To use several leds in parallel sum the current values. For safe calculation you may take 50 ohms. How to find the value o...
