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Why should the resistance of : (a) an ammeter be very small ?

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Why should the resistance of : 

(a) an ammeter be very small ? 

(b) a voltmeter be very large ?

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(a) The resistance of an ammeter should be very small so that it may not change the value of the current flowing in the circuit.

(b) The resistance of a voltmeter should be very large so that it takes a negligible current from the current.

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