Question

A battery E is connected in series to an ammeter and a voltmeter such that the respective readings are A and V. Now a resistance is joined in parallel with the voltmeter. Then 

(a) A increases, V decreases 

(b) A decreases, V increases 

(c) A and V both decreases 

(d) A and V both increases

Answer 1

Correct option: (a) A increases, V decreases

Explanation: 

Whenever a resistance is joined in parallel with the voltmeter, the total resistance of the circuit decreases so that the current increases and hence ammeter reading also increases. The equivalent resistance across the voltmeter decreases and hence its reading will decrease.