Question

The values of current (I) flowing through a given resistor of resistance (R), for the corresponding values of potential difference (V) across the resistor are as given below:

V (volts)	0.5	1.0	1.5	2.0	2.5	3.0	4.0	5.0
I (amperes)	0.1	0.2	0.3	0.4	0.5	0.6	0.8	1.0

Plot a graph between current (I) and potential difference (V) and determine the resistance (R) of the resistor.

Answer 1

The plot between current (I) and potential difference (V) is given as, 

Resistance of the resistor = Slope of the above graph
Chose two points A and B on the graph, 

Slope of the graph is = Slope of line AB = `(4-1)/(0.8-0.2) = 3/0.6` = 5 Ω