Measurement and Instrumentation
Which of following is not correct?

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

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Measurement and Instrumentation
Assertion (A): A hot wire ammeter has a cramped scale. Reason (R): The heat is proportional to square of current.

 A is ture and R is false.
 Both A and R are true and R is not correct explanation of A.
 A is false and R is ture.
 Both A and R are true and R is correct explanation of A.

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