How a Transistor (MOSFET) Switches
How voltage switches current on and off
0:56 · 720p · With AI narration and captions. This sample was made with the same system as this service.
Narration (full text)
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The Transistor (MOSFET)
A MOSFET is a type of transistor that uses voltage to switch current on and off.
Inside a MOSFET
A source and a drain sit in p-type silicon. Above the gap between them is a gate, on a thin insulating film.
No Voltage: Off
With no voltage on the gate, there is no path between them, so no current flows. This is off.
With Voltage: On
Apply a positive voltage to the gate, and electrons gather to form a channel, so current flows. This is on.
On = 1, Off = 0
Remove the voltage, and the channel disappears and the current stops. Digital circuits use on and off to represent 1 and 0.
Billions on a Chip
A computer chip holds billions of these transistors.
A Voltage-Controlled Switch
The gate voltage creates and removes the channel, switching the current on and off.
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