Which of the following instrument is most accurately for comparing electromotive force (e.m.f) of two cells?
-
A.
Voltmeter -
B.
Meter rule -
C.
Galvanometer -
D.
Potentiometer
Correct Answer: Option D
Explanation
Voltmeter: an instrument for measuring electric potential in volts
Galvanometer: it is a device used to indicate direction of a small electric current
Potentiometer: is a device for measuring or comparing e.m.fs of cells
Meter rule: measuring a distance at different points
There is an explanation video available below.