Enter any two values; leave the others blank.
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Voltage (V)
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Current (A)
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Resistance (Ω)
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Power (W)
Frequently Asked Questions
What is Ohm’s Law?
Ohm’s Law states V = I × R: voltage equals current times resistance. Power P = V × I. Enter any two of voltage, current and resistance and the rest are calculated.
Apply Ohm’s Law: enter any two of voltage, current and resistance to find the rest, plus power.