How do you calculate power?
GeneralClass 12AllAnswered 27 Mar 2026
Answer
Power is calculated using the formula P = V × I, where:
- P = Power (watts)
- V = Voltage (volts)
- I = Current (amperes)
Alternative formulas include:
- P = I² × R (Power = Current suared × Resistance)
- P = V²/R (Power = Voltage suared ÷ Resistance)
For example, if a device operates at 120 volts and draws 5 amperes, its power consumption is 600 watts (120V × 5A = 600W). Power represents the rate at which electrical energy is consumed or converted to other forms of energy like heat or light.
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