Physics
JAMB 2015
Which of the following instrument is most accurately for comparing electromotive force (e.m.f) of two cells?
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A.
Voltmeter
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B.
Meter rule
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C.
Galvanometer
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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
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