Question

Give 5 points difference between end of a cell and terminal potential of a cell

Answer 1

Explanation:

P.D.=2.2volts , this is the EMF of the cell.

Now when the circuit is closed and a current is flowing through the circuit then the P.D.=1.8V

Thus the total resistance of the circuit is R+r=5+rohms

So, the current in the circuit is i=(

5+r

2.2

)

hence the PD across the internal resistance.

Given that,

r(

5+r

2.2

)=2.2−1.8 as the drop in the potential across the battery is due the P.D. across the internal resistance.

So,

r(

5+r

2.2

)=0.4

1.8r=2

r=1.11ohms