Question

A
voltmeter has resistamce of 100 ohm what will it read when connected across a cell of emf 2V and internal resistance 20 ohm​

Answer 1

Answer:

1.68 V

Explanation:

Given:

R = 100 Ω,  

r = 20 Ω,  

E = 2 V  

To find:

Reading of voltmeter (V)  

Formula:

V = E - Ir  

Solution:

Current through the circuit is given by  I= E/(R+r)

I= 2/(100+20)

I=2/120

I=0.016A

∴V=2-(0.016*20)

V=2-0.32

V = 1.68 V  

The reading on the voltmeter is 1.68 V