How do I calculate power (kW) given voltage (V) and current (A)?
GeneralClass 12AllAnswered 27 Mar 2026
Answer
4.
To calculate power in kilowatts from voltage and current:
Step 1: Use the formula P = V × I (result in watts) Step 2: Convert to kilowatts by dividing by 1,000
Formula: P (kW) = (V × I) / 1,000
Example:
- Voltage = 240V
- Current = 20A
- P = (240 × 20) / 1,000 = 4.8 kW
Quick reference:
- 1 kilowatt (kW) = 1,000 watts (W)
- Typical household appliances use 0.1 to 3 kW
- Industrial equipment often uses 10+ kW
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