Question

 A cell of emf E and internal resistance r is connected across an external resistance R. Plot a graph showing the variation of P.D. across R, verses R.​

Answer 1

Answer:

PHYSICS

A cell of emf E and internal resistance r is connected across an external resistance R. Plot a graph showing the variation of P.D. across R, versus R.

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ANSWER

We know that I=

R+r

E

and V=IR

So V=

R+r

ER

…(I)

V=

1+

R

r

E

Here E, r are constants. So

V∝

1+

R

r

1

(from II)

and V∝R (from I)

With increase in R, P.D. across R is increased up to maximum value E.

solution