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Electric Power Calculator

Voltage (V)

Current (A)

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What is Electric Power Calculator?

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Electric power is the rate at which electrical energy is transferred or consumed. P = V × I (voltage × current), and by Ohm's law can also be expressed as P = I²R or P = V²/R. Measured in watts (W) or kilowatts (kW).

Calkulon makes complex calculations simple — built for students and everyday problem-solvers.

How to Electric Power Calculator

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1P = V × I (Power = Voltage × Current)
2P = I² × R (using resistance and current)
3P = V² / R (using resistance and voltage)
4Energy consumed: kWh = kW × hours; cost = kWh × tariff rate

Worked Examples

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Example 1

Given:230V supply · 5A current

Αποτέλεσμα:Power = 1,150W (1.15 kW)

230 × 5 = 1,150

Example 2

Given:2kW heater on 4 hours · 28p/kWh tariff

Αποτέλεσμα:Cost = £0.56 (56p)

2 × 4 × 0.28 = £2.24/day if 4hr/day

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Did you know?

The entire electrical output of a nuclear power plant (about 1 GW = 1,000,000,000 W) could power approximately 700,000 UK homes. A single human at peak physical output generates about 400W — the same as four bright light bulbs.

References

›Electric power — Wikipedia

Formula-verified for precision

Reviewed October 2026

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Electric Power Calculator