An unknown resistor is wired in series with an ammeter, and a voltmeter is placed in parallel across both the resistor and the ammeter. This network is then placed across 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 reads the voltage across both the resistor and the ammeter, leading to a higher voltage reading than just across the resistor. Thus, the calculated resistance is greater than the true resistance of the resistor alone.

An Unknown Resistor Is Wired in Series with an Ammeter