First slide

voltmeter

Question

An ammeter and a voltmeter of resistance R are connected in series to an electric cell of negligible internal resistance. Their readings arc A and V, respectively. If another resistance R is connected in parallel with the voltmeter, then

Easy

A

both A and V will increase
B

both A and V will decrease
C

A will decrease and V will increase
D

A will increase and V will decrease

Solution

After connecting a resistance R in parallel with the voltmeter, its effective resistance decreases. Hence, less voltage appears across it, i.e., V will decrease. Since overall resistance decreases, so more current will flow, i.e., A will increase.

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