In a field-effect transistor, which two electrodes are connected to the ends of the channel?

A field-effect transistor (FET) controls the flow of electricity through a conductive pathway called the channel. The two terminals physically connected to the opposite ends of this channel are the source and the drain. Charge carriers (electrons or holes) enter the channel at the source and exit at the drain. The third terminal, the gate, sits beside or surrounds the channel and uses an electric field to control how much current can pass between the source and drain. Options including the gate or base are incorrect because the gate acts as a control valve rather than an endpoint of the channel, and the base is a term used for bipolar transistors, not FETs.