Ohm's Law Calculator
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Current (A)
Resistance (Ω)
Ohm's Law states that voltage (V) equals current (I) multiplied by resistance (R): V = IR. It is the foundation of electrical circuit analysis. Power (P = VI = I²R = V²/R) describes the energy converted per second.
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Pro Tip
Most household circuits are 15A (US) or 20A. A 15A/120V circuit can handle up to 1,800W. Running appliances above this trips the circuit breaker.
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Did You Know?
Georg Ohm published his law in 1827. It was initially rejected by scientists — the Royal Society awarded him the Copley Medal 14 years later once it was proven experimentally valid.
References
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