Home & workshop Conversions
Watts to volts
Power
W
Current
A
Voltage 12 V
V = P ÷ I = 60 ÷ 5
Resistance 2.4 Ω
V = P/I · V = √(PR)
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320 × 100
Watts alone do not give volts — you need a second quantity. With current, V = P ÷ I. With resistance, V = √(P × R). Sixty watts at five amps is twelve volts; sixty watts into ten ohms is 24.5 volts.
How to convert watts to volts
1 Decide which second quantity you know: current or resistance.
2 Pick the matching tab.
3 Enter both values.
4 Read the voltage and the remaining quantity as a cross-check.
The reason a plain watts-to-volts converter cannot exist is that power is a product of two independent quantities. A 60 W load could be 12 V at 5 A, 230 V at 0.26 A, or anything else on the same curve. Where this conversion genuinely comes up is in reverse-engineering a component: you know a resistor dissipates a certain power and you know its value, and you want the voltage across it — which is the square-root form.
Questions
No. Power is volts times amps, so you need one of the other quantities.
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300 × 250
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