Witch resistor use in 12 volt cob led – InterviewSolution

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Witch resistor use in 12 volt cob led

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Answer:

Resistor = (Battery Voltage – LED voltage) / desired LED current. So assuming a 12 volt power source and a white LED with a desired current of 10 mA; The FORMULA BECOMES Resistor = (12-3.4)/. 010 which is 860 ohms. Since this is not a standard value I would USE an 820 OHM resistor.

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