Physics

Electrical Power Calculator

Find electrical power and resistance from voltage and current.

Calculated Output

Power (W) 600

Resistance (Ω) 24

Formula: P = V × I ; R = V ÷ I

Step-by-Step Breakdown

1. Values used:

2. Voltage = 120 V

3. Current = 5 A

5. Power = Voltage x Current = 120 x 5 = 600W

6. Resistance = Voltage / Current = 120 / 5 = 24Ω

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The math behind it

P = V × I. The implied resistance is R = V ÷ I (Ohm's law).

120 V × 5 A = 600 W (resistance 24 Ω).

How do I get energy over time?

Energy (Wh) = power (W) × hours. A 600 W device for 2 h uses 1,200 Wh = 1.2 kWh.