Question

A battery of e.m.f 6 V and internal resistance 2 ohm is connected in parallel with another battery of e.m.f. 5 V and internal resistance 2 ohm. The combination is used to send current through an external resistance of 8 ohm. Calculate the current through the external resistance.

Answer 1

Explanation:

Given,

E=−6 V,r=2Ω and i=1.5 A

We know that, current across a circuit,

i=

r+R

E

⇒15=

2+R

6

⇒2+R=

15

6

or R=4−2=2Ω.