It is required to measure the true open circuit e.m.f. of a battery. The best device is
A)d.c. voltmeter
B)ammeter and a known resistance
C)d.c. potentiometer
D)none of the above

Question

Quizplus · Accepted Answer

A d.c. potentiometer is the most accurate device for measuring the true open circuit e.m.f. of a battery because it does not draw any current from the battery during the measurement, thus avoiding any voltage drop due to internal resistance, leading to a more accurate measurement of the battery's e.m.f.

It Is Required to Measure the True Open Circuit E