Question

A cell of emf 3 V and internal resistance 075 $\Omega$ is connected to a nonlinear conductor whose VI graph is shown in figure obtain graphically the current drawn from the cell.

Answer 1

Here draw a straight line $V=E-Ir$ where $E=3V,r=0.75\Omega$ as shown in figure.
when $I=0,V=3$ and when $V=0,I=4A$
The intersection of this line with V-I plot for the conductor gives the current 2 A.