Question

A graph between potential difference (V)

and current (I) is given in figure.

(i) What is the relation between V and I. (ii) Find

the resistance of the conductor using the graph​

Answer 1

Answer:

(i) V is directly proportional to I. When potential difference increases between any two point in a conductor or wire, its current also increases. Hence its straight line shown by the figure.

(ii) From Ohm's law

V=IR

R=V/I

Let, at I=0.5 A , V= 2 volt

R=V/I= (2/0.5) ohm =4 ohm

Say for another coordinate

I=1.5A, V=6 volt

R=(6/1.5) ohm = 4 ohm

Explanation:

So the resistance used=4 ohm