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Ohm's Law
From voltage and current, compute resistance and power using Ohm's law and the power equation. A staple for electronics, wiring and hobby projects.
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Worked example
Resistance Ω: 6 · Power W: 24
How it’s solved
Worked on the example above, step by step — follow along and you can do it on paper next time, no tool required.
- Ohm's law ties voltage, current and resistance together; electrical power is voltage times current.
- Resistance = volts ÷ amps
12 ÷ 2 = 6 Ω - Power = volts × amps
12 × 2 = 24 W
Learn the method
Inputs
- Volts
12 - Amps
2
Frequently asked
What are the formulas?
Resistance = V ÷ I and power = V × I.
At 12 V and 2 A?
Resistance is 6 Ω and power is 24 W.