What is the formula for electrical power in terms of resistance and current?

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Prepare for the Electrical Academy Level 1 Test. Study with multiple choice questions, flashcards, and detailed explanations. Assess your knowledge and ace the exam!

Multiple Choice

What is the formula for electrical power in terms of resistance and current?

Explanation:
Power in a resistor is found from P = VI. Using Ohm’s law V = IR, substitute into that: P = I(IR) = I^2 R. This directly expresses power in terms of current and resistance, which is exactly what’s asked for. The other common forms—P = VI and P = V^2 / R—are equivalent, but they involve voltage; they only match the current-and-resistance form if you replace V with IR.

Power in a resistor is found from P = VI. Using Ohm’s law V = IR, substitute into that: P = I(IR) = I^2 R. This directly expresses power in terms of current and resistance, which is exactly what’s asked for. The other common forms—P = VI and P = V^2 / R—are equivalent, but they involve voltage; they only match the current-and-resistance form if you replace V with IR.

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