In a DC circuit, the power equation is given by which expression?

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Study for the Junior Officer Surface Material Readiness Course Test. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

In a DC circuit, the power equation is given by which expression?

Explanation:
Power in a DC circuit equals the product of voltage and current. If the source voltage is denoted by E (the emf), the power delivered is P = E × I. This is the same relationship as P = V × I, just using E for voltage. The other forms aren’t universal: P = I^2 × R applies specifically to a resistor with resistance R (derived from V = IR), and P = E / I would give units of resistance, not watts, so it doesn’t describe power.

Power in a DC circuit equals the product of voltage and current. If the source voltage is denoted by E (the emf), the power delivered is P = E × I. This is the same relationship as P = V × I, just using E for voltage. The other forms aren’t universal: P = I^2 × R applies specifically to a resistor with resistance R (derived from V = IR), and P = E / I would give units of resistance, not watts, so it doesn’t describe power.

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