exercise 8a numerical 8

In an experiment of verification of Ohm's law, following observations are obtained.

Draw a characteristic V-I graph and use this graph to find :

(a) potential difference V when the current I is 0.5 A.

(b) current I when the potential difference V is 0.75 V.

(c) resistance in circuit

 Solution for the question posted in the image is as follows: - 

 

 

→ 

 

(a) 

From graph,

When I = 0.5 A

V = 1.25 V

(b) When V =0.75 V 

I =0.3 A

(c) The graph is linear so resistance can be found from any value of the given table. For instance :

When V=2.5 Volt

Current is I=1.0 amp

According to ohm's law :

R=V/I

R=2.5/1.0 = 2.5 ohm