Electron from drain to gate

Electron from source to drain

Electron from drain to source

Electron from gate to source

20 V

30 V

40 V

50 V

100 mw

200 mw

300 mw

400 mw

UJT

SCR

FET

LED

Reverse current conduction commences

Forward current conduction stops

Reverse current turned off

Forward current conduction commences