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resitance equation for Led's? Answered

Could you show me how you got the 300ohms from your example above? I have a feeling it has something to do with decimal places but I am not sure how. I got a value of .3

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YasserA12

11 days ago

the rated current of the led is in milliamps but the equation requires current in amps so you have to convert 20 milliamps to amps 20 / 1000 = 0.02
(9 - 3) / 0.02 = 300 ohm