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Physical / electrical concepts

Drain / Source / Gate

The three terminals of a MOSFET. Gate = control input. Drain and Source = the two ends of the switch.

How it looks

Drawing
A MOSFET SYMBOLgatedrainsource
Gate on the left; drain and source are the two ends of the switch.

How it works

A MOSFET AS A SWITCHgatedrainsourcegate low: no path between drain and sourcegatedrainsourcegate high: current flows drain to source

Where it fits

These are the terminals of an n-channel MOSFET and a p-channel MOSFET; a MOSFET card covers the part itself.

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