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