Question

A battery of EMF 10 V, with internal resistance 1

Ω is being charged by a 120 V d.c. supply using a

series resistance of 10 Ω. The terminal voltage of

the battery is​

Answer 1

Answer:

E=8V, internal resistance R

1

=0.5Ω

V=120V, resistance R

2

=15.5Ω

Effective voltage V

′

=V−E=112 V

I=

R

1

+R

2

V

′

=7 A

Voltage across R

1

=IR

1

=3.5 V

Terminal voltage =8+3.5=11.5 V

Series resistor in the charging circuit limits the current drawn from the external source.