Which unit measures electrical power?

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Study for the Con Edison Basic Electric Test. Prepare with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

Which unit measures electrical power?

Explanation:
Power in an electrical circuit is the rate at which energy is transferred. The unit for that rate is the watt. A watt is defined as one joule per second, so it directly expresses how quickly energy is used or produced. In circuits, power is calculated as P = V × I, which naturally leads to the watt as the standard unit. A volt measures electrical potential difference, an ampere measures current, and a joule is an amount of energy, not a rate. So the correct unit for electrical power is the watt.

Power in an electrical circuit is the rate at which energy is transferred. The unit for that rate is the watt. A watt is defined as one joule per second, so it directly expresses how quickly energy is used or produced. In circuits, power is calculated as P = V × I, which naturally leads to the watt as the standard unit. A volt measures electrical potential difference, an ampere measures current, and a joule is an amount of energy, not a rate. So the correct unit for electrical power is the watt.

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