Which formula correctly expresses voltage drop in a circuit?

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Prepare for the Western Maricopa Education Center (West-MEC) RMA-AMT Module 3 Test with engaging content and multiple-choice questions. Sharpen your skills and enhance your knowledge. Succeed on your path to certification!

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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