So if you have a LED that should be powered by 3.2v and 0.024 amps, and a 9v battery, the calculation should be:
(9 - 3.2) / 0.024
And that gives you 240 ohms
Bonus : Watts Calculation
If you want to calculate the watts of this LED (which is actually the power it will consume) you have to do this:
Power (watts) = Voltage * Current (amps)
So:
Power = 3.2 * 0.024 = 0.0768 W
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