Question

The values of current I flowing in a given resistor for the corresponding values of potential difference V across the resistor are given below:

I (amperes)	0.5	1.0	2.0	3.0	4.0
V (volts)	1.6	3.4	6.7	10.2	13.2

Plot a graph between V and I and calculate the resistance of that resistor.

Answer 1

The plot between voltage and current is called IV characteristic. The voltage is plotted on x-axis and current is plotted on y-axis. The values of the current for different values of the voltage are shown in the given table.

V (volts)	1.6	3.4	6.7	10.2	13.2
I (amperes)	0.5	1.0	2.0	3.0	4.0

The IV characteristic of the given resistor is plotted in the following figure.

For V = 4 V (i.e., 9 V − 5 V)

I = 1.25 A (i.e., 2.65 A − 1.40 A).

∴ `"R" = "V"/"I"`

= `(4 "V")/(1.25 "A")`

= 3.2 Ω

The accuracy of the graph's plotting determines the value of R that is found on it.