Question

Why in electric circuit ammeter is connected in series and voltmeter is connected in parallel across the points where potential difference is to be measured ?

Answer 1

Voltmeter is used to measure potential difference.It is always connected in parallel across the points where the potential difference is to measured. So one end of the voltmeter is connected to the point A of a resistance AB and the other end to the point B,and also it has a high resistance so that it takes a negligible current from the circuit.

Ammeter is always connected in series with the circuit in which current to be measured ,Since current remains same in series connection and also the resistance of an ammeter is very small so that it may not change the value of current.