How to calculate electric power?
GeneralClass 12AllAnswered 27 Mar 2026
Answer
To calculate electric power, follow these steps:
- Identify what values you have (voltage, current, or resistance)
- Select the appropriate formula from P = VI, P = I²R, or P = V²/R
- Plug in your values with consistent units (volts, amperes, ohms)
- Perform the calculation
Example: If a device operates at 120 volts and draws 5 amperes, the power is P = 120V × 5A = 600 watts.
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