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The MOSFET is a type of FET that works by electronically varying the width of a channel along which electrons flow. The width of the channel is controlled by the voltage on an electrode called the gate , which is located physically between the source and the drain and is insulated from the channel by an extremely thin layer of metal oxide.[[Image:dualgatemosfet.png|left]] The MOSFET is a type of FET that works by electronically varying the width of a channel along which electrons flow. The width of the channel is controlled by the voltage on an electrode called the gate , which is located physically between the source and the drain and is insulated from the channel by an extremely thin layer of metal oxide.