APFIVE Non-Ideal Voltmeter in a Wheatstone Bridge
In a Wheatstone bridge circuit used to measure an unknown resistance, a voltmeter is connected between the midpoints of the two branches. If the voltmeter has a resistance of 100 kΩ instead of being ideal, which of the following best describes the effect on the measurement when the bridge is nearly balanced?
A
The power dissipation in the circuit will significantly increase
B
Small currents through the voltmeter will prevent perfect balance
C
The unknown resistance will appear larger than its actual value
D
The bridge will balance more quickly due to feedback effects
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