electronics

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Capacitors Capacitors are devices that store electrical energy in an electric field by accumulating electric charges on two surfaces insulated from each other but in proximity
Valves A thermionic valve (or vacuum tube) is a device that controls electric current flow in a high vacuum between electrodes to which a high voltage has been applied.
Cathode Ray Tube Cathode Ray Tube (CRT) is an earlier display screen technology that was used before LCDs and LEDs. It's a bit like a valve (has a heater, cathode and anode) but works at a much higher voltage.
Resistors Resistors are a passive two-terminal electrical component that implements electrical resistance as a circuit element