Which formula would you use to find power if voltage and current are known?

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Multiple Choice

Which formula would you use to find power if voltage and current are known?

Power in an electrical circuit is found by multiplying voltage by current. When you know the voltage (E) and the current (I), the power is P = E × I. In SI units, volts times amperes equals watts, so the result is the power in watts. For example, if E is 120 volts and I is 2 amperes, P = 240 watts. The other expressions don’t give power: adding voltage and current isn’t how power is computed, and dividing voltage by current would yield resistance (V = IR, so V/I = R).

Power in an electrical circuit is found by multiplying voltage by current. When you know the voltage (E) and the current (I), the power is P = E × I. In SI units, volts times amperes equals watts, so the result is the power in watts. For example, if E is 120 volts and I is 2 amperes, P = 240 watts. The other expressions don’t give power: adding voltage and current isn’t how power is computed, and dividing voltage by current would yield resistance (V = IR, so V/I = R).

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