Which formula correctly expresses voltage drop in a circuit?

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Study for the Western Maricopa Education Center RMA-AMT Module 3 Test with interactive multiple choice questions designed to help you succeed. Prepare for your exam with comprehensive hints and explanations. Get ready to excel!

Multiple Choice

Which formula correctly expresses voltage drop in a circuit?

Explanation:
Voltage drop across a resistor follows Ohm's law: the drop equals the current through the element times its resistance. In symbols, V_drop = I × R. This matches the units volts = amps × ohms. The order doesn’t change the value (R × I would give the same result), but the conventional way to express it is V = IR, with the current first. The other expressions don’t represent voltage drop: multiplying by power (P × I) isn’t a voltage, and adding I and R combines unlike quantities.

Voltage drop across a resistor follows Ohm's law: the drop equals the current through the element times its resistance. In symbols, V_drop = I × R. This matches the units volts = amps × ohms. The order doesn’t change the value (R × I would give the same result), but the conventional way to express it is V = IR, with the current first. The other expressions don’t represent voltage drop: multiplying by power (P × I) isn’t a voltage, and adding I and R combines unlike quantities.

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