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Electric Power Calculator

Voltage (V)

Current (A)

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Là gì 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).

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Cách 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

Ví dụ có lời giải

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Ví dụ 1

Cho trước:230V supply · 5A current

Kết quả:Power = 1,150W (1.15 kW)

230 × 5 = 1,150

Ví dụ 2

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

Kết quả:Cost = £0.56 (56p)

2 × 4 × 0.28 = £2.24/day if 4hr/day

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Bạn có biết?

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.

Tài liệu tham khảo

›Electric power — Wikipedia

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Reviewed October 2026

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Electric Power Calculator