USCG USCG Electrical
Set 1 • Question #8 of 142
Launch Interactive Practice Room A resistance in a circuit of unknown value is to be tested using the voltmeter/ammeter method. Therefore, the meters should be connected with __________.
A
both meters in series with the resistance
B
both meters in parallel with the resistance
C
the ammeter in series and the voltmeter in parallel with the resistance
✓ Correct Answer
D
the ammeter in parallel and the voltmeter in series with the resistance
USCG NMC Regulatory Explanation
Voltmeter loading effect occurs when the meter draws appreciable current from the circuit under test, distorting the measured voltage. Selecting a meter with an input impedance much higher than the circuit impedance ensures minimal parallel loading and accurate readings.
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