Measurement and Instrumentation
Which of following voltmeters would you use for measuring voltage across 20KΩ resistance

 None of above.
 Voltmeter having sensitivity of 1 KW/V.
  Voltmeter having sensitivity of 10 KW/V.
 Voltmeter having a resistance of 5 ΩK.

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

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

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