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
Answer:C
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