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Measurements and Instrumentation - Engineering

Q1:

Potentiometer method of dc voltage measurement is more accurate than direct measurement using a voltmeter because

A it loads the circuit to maximum extent

B it loads the circuit moderately

C it does not load the circuit at all

D it uses centre zero galvanometer instead of Voltmeters

ANS:C - it does not load the circuit at all

Since the circuit is not loaded, the accurate value of dc voltage is measured.