amorphous semiconductor
amplifier

band gap
bandpass filter

cathode
cavity magnetron
choke

diode
dopant

electrode
electron
electron tube
electronics

feedback
Fermi level
filter
flip-flop

Geissler tube

Hall effect
hole

klystron

logic circuit

magnetron

n-type semiconductor

oscillator

photodiode
photoelectric cell
photomultiplier
p-n junction
p-type semiconductor

resistor

Schottky barrier
semiconductor
space charge

transistor
tunnel diode

Zener diode