Which unit is used to measure electrical power?

Prepare for the NLN PAX Science Exam with flashcards and multiple choice questions. Each question includes hints and detailed explanations to boost your confidence and exam readiness.

Multiple Choice

Which unit is used to measure electrical power?

Explanation:
Power in an electrical context is the rate at which energy is transferred or work is done. The unit that expresses this rate is the watt. One watt equals one joule of energy per second, so watts measure how quickly electrical energy is used or produced. In circuits, power can be calculated as P = V × I, where voltage is the electric potential difference and current is the flow of charges. This means if a device operates at 12 volts and draws 2 amperes, its power is 24 watts. The other units correspond to different quantities: joule is energy, volt is potential difference, and ampere is current. The watt specifically measures power.

Power in an electrical context is the rate at which energy is transferred or work is done. The unit that expresses this rate is the watt. One watt equals one joule of energy per second, so watts measure how quickly electrical energy is used or produced. In circuits, power can be calculated as P = V × I, where voltage is the electric potential difference and current is the flow of charges. This means if a device operates at 12 volts and draws 2 amperes, its power is 24 watts. The other units correspond to different quantities: joule is energy, volt is potential difference, and ampere is current. The watt specifically measures power.

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