An unknown resistor is wired in series and an ammeter and a voltmeter are 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 the true resistance.
B) could be anything. It depends on other factors.
C) is less than the true resistance.
D) is greater than the true resistance.

Question

Quizplus · Accepted Answer

The voltmeter measures the voltage across both the resistor and the ammeter, leading to a higher voltage reading than across the resistor alone. Thus, the calculated resistance is greater than the true resistance.

An Unknown Resistor Is Wired in Series and an Ammeter