Measurement and Instrumentation
The effect of load resistance is important in measurement of

 resistance of shunt.
 both A and B.
 resistance of ammeter.
 resistance of shunt winding.

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Measurement and Instrumentation
Potentiometer method of DC voltage measurement is more accurate than direct measurement using a voltmeter because

  It does not load the circuit at all.
 It uses centre zero galvanometer instead of voltmeter.
 It loads the circuit moderately.
 It loads the circuit to maximum extent.

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