Drain Current Versus Drain Voltage:
The Drain current ID can be plotted as a function of drain voltage ED for different values of gate bias voltage EG. The resultant set of curves is termed as a family of characteristic curves for the device. Figure below shows a family of characteristic curves for a hypothetical n-channel JFET. The curve of ID versus EG is also of significance.
Figure: The family of characteristic curves for a hypothetical n-channel JFET.