Measurement and Instrumentation
Which of following is not correct?

 An ammeter should have a very low resitance.
 A shunt should have a very low resistance.
 Voltmeter should have very high resistance.
  An electronic voltmeter draw appreciable current from the source.

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

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