Which expression correctly defines electrical power in terms of voltage and current?

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Study for the Mechatronics End-of-Pathway (EOP) Test. Explore flashcards and multiple-choice questions, each with hints and explanations. Prepare confidently for your exam!

Multiple Choice

Which expression correctly defines electrical power in terms of voltage and current?

Explanation:
Power is the rate at which electrical energy is transferred. The direct relationship between this energy flow, voltage, and current is P = V × I. Voltage provides the energy per unit charge, and current tells how many charges pass per second; multiplying them gives the energy transferred per second, i.e., power, measured in watts. You’ll also see related forms like P = I^2R or P = V^2/R when you apply Ohm’s law (V = IR) to a resistor, but the simplest and most general expression that uses both voltage and current is P = VI. The idea that P could be R × I isn’t correct for power, since that wouldn’t have the proper units of watts.

Power is the rate at which electrical energy is transferred. The direct relationship between this energy flow, voltage, and current is P = V × I. Voltage provides the energy per unit charge, and current tells how many charges pass per second; multiplying them gives the energy transferred per second, i.e., power, measured in watts. You’ll also see related forms like P = I^2R or P = V^2/R when you apply Ohm’s law (V = IR) to a resistor, but the simplest and most general expression that uses both voltage and current is P = VI. The idea that P could be R × I isn’t correct for power, since that wouldn’t have the proper units of watts.

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