How to calculate power in watts?
GeneralClass 12AllAnswered 27 Mar 2026
Answer
To calculate power in watts, multiply voltage (in volts) by current (in amperes): Watts = Volts × Amperes. For example, a 12-volt device drawing 2 amperes consumes 12 × 2 = 24 watts. If you only know voltage and resistance, use Watts = V²/R. If you only know current and resistance, use Watts = I²R.
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