Question

7. For the two circuits I and II shown below, The voltmeter reading would be-
a) 0V in circuit I and 2V in circuit II
b) 3V in both the circuits
c) 0V in circuit I and 3V in circuit II
d) 3V in circuit I and 0V in circuit II​

Answer 1

Answer:

In the Fig I , the key is open so no current flow in the ammeter. Thus the reading of voltmeter will be zero.

In the fig II, the key is closed and the current in the circuit I=  

2

2

​  

=1A. Thus the voltmeter reading = voltage across 2Ω =2I=2 V

Answer 2

For the two circuits I and II shown below, The voltmeter reading would be (c) 0V in circuit I and 3V in circuit II

Explanation:

• in the given two circuit, the first circuit has a voltmeter, ammeter and a switch connected to the circuit but in this circuit the switch is open so that there will be no current flow in the circuit
• in the second circuit the resistance is parallelly connected to the voltmeter and when the current flows the reading of the voltmeter will be 3V