An unknown resistor is wired in series with an ammeter, and a voltmeter is placed in parallel across the resistor only. This network is then connected to a battery. If one computes the value of the resistance by dividing the voltmeter reading by the ammeter reading, the value obtained
A)is less than the true resistance.
B)is greater than the true resistance.
C)is the true resistance.
D)could be any of the given answers. It depends on other factors.

Question

Quizplus · Accepted Answer

The voltmeter has a finite resistance, which draws some current, leading to a lower voltmeter reading than the true voltage across the resistor. This results in a calculated resistance that is less than the true resistance.

An Unknown Resistor Is Wired in Series with an Ammeter