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Which of the following is not a requirement for a DC ammeter’s shunt?

Which of the following is not a requirement for a DC ammeter’s shunt? Correct Answer High thermal automotive force

The general requirements for shunts are:

  • The temperature coefficient of shunt and instrument should be low and should be as nearly as possible the same
  • The resistance of shunts should not vary with time i.e. time invariant
  • They should carry the current without excessive temperature rise
  • They should have a low thermal electromotive force with copper

Manganin is usually used for shunts of DC instruments as it gives a low value of thermal emf with copper although it is liable to corrosion and is difficult to solder.

Constantan is a useful material for AC circuits since its comparatively high thermal emf, being unidirectional, is ineffective in these circuits.

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