question_answer

A galvanometer can be changed into an ammeter by using

A)                 low resistance shunt in series

B)                 low resistance shunt in parallel

C)                 high resistance shunt in series

D)                 high resistance shunt in parallel

Correct Answer: B

Solution :

                Key Idea: An ammeter has low resistance in the circuit as it measures the strong current. A galvanometer as such cannot be used as an ammeter because it has appreciable resistance and it can measure only a limited current corresponding to the maximum deflection on its scale. In practice, an ammeter is made by connecting a low resistance S in parallel with a pivoted type moving coil  galvanometer G. S is  known as shunt. Its  Value depends upon  the range of the   required ammeter.