APFIVE Voltmeter Loading Effect
In a complex DC circuit, a voltmeter with resistance $R_v$ is connected across a resistor $R$. The ratio of the actual voltage $V_0$ across $R$ (without the voltmeter) to the measured voltage $V_m$ is best expressed as:
A
$$V_0/V_m = 1 - R/R_v$$
B
$$V_0/V_m = R_v/(R + R_v)$$
C
$$V_0/V_m = 1 + R/R_v$$
D
$$V_0/V_m = (R + R_v)/R_v$$
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