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NCCER Introduction To Electrical Circuits (26103-23) Practice Test

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What is the SI unit of power?
Correct Answer:
Watt (W)
Explanation:
Power in electrical circuits is the rate at which electrical energy is converted or transferred to another form, such as light, heat, or motion. In SI units, this rate is measured in watts. A watt means one joule of energy moved or used each second, so P = energy per time. In practical terms for circuits, power also equals voltage times current (P = V × I), which aligns with the unit watt since volts times amperes give joules per second. The other units serve different roles: volt measures electrical potential difference, ampere measures current, and joule measures energy. So the SI unit for power is the watt.

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