From the previous example, we have seen that power in electrical circuits can be found like this: power = current × voltage or P = I × V e.g. a 6 V battery provides 2 A to a bright torch. P = I × V = 2 A × 6 V = 2 C/s × 6 J/C = 12 J/s = 12 W. Once you're happy with using the formula, we normally write this in its simplest form: P = I × V = 2 A × 6 V = 12 W Since we know that current is in A and voltage in V.
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