Question

For a p-channel FET, What is the direction of current flow?

(a) Source to drain

(b) Drain to source

(c) Gate to source

(d) Gate to drain

This question was addressed to me during a job interview.

This intriguing question comes from The Junction Field-Effect Transistor in portion Field-Effect Transistors of Electronic Devices & Circuits

Answer 1

Right choice is (a) Source to drain

Explanation: When the voltage is lesser than pinch off, the current flows from Source to Drain.

The forward bias drain and gate is the reason for the flow of electron from Drain to source, as the conventional current flows opposite to the electron flow, the current will flow from Source to Drain.