USCG USCG Electrical
Set 1 • Question #1 of 142
Launch Interactive Practice Room When troubleshooting most electronic circuits, 'loading effect' can be minimized by using a voltmeter with a/an __________.
A
input impedance much greater than the impedance across which the voltage is being measured
✓ Correct Answer
B
input impedance much less than the impedance across which the voltage is being measured
C
sensitivity of less than 1000 ohms/volt
D
sensitivity of more than 1000 volts/ohm
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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