Question

a cell of e.m.f R is connected with external resistance R and the p.d. across the cell is V the internal resistance of cell will be​

Answer 1

Explanation:

From ohm's law:

Let the current in the circuit =i=

R

V

P.D Across the cell, E=V+ir

⇒r=

i

E−V

=

V/R

E−V

=(

V

E−V

)R