When there is no voltage across the gate terminal, then the device does not conduct. Please refer to this link to know more about Depletion Mode MOSFET Enhancement Mode Whereas when the voltage across the gate terminal is either positive or negative, then the channel conductivity decreases. When there is no voltage across the gate terminal, the channel shows its maximum conductance. The MOS capacity that exists in the device is the crucial section where the entire operation is across this. It is insulated from the channel near an extremely thin layer of metal oxide.
The width of the channel is controlled by the voltage on an electrode which is called the gate and it is located in between the source and the drain.
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