NPN Transistor
Actual/Physical Appearance:
- Has three-terminal namely emitter, base and collector.
Use/Application:
- It passes electrons from the emitter to the collector.
- It may function as either amplifiers or electronic switches.
Zener Diode
Actual/Physical Appearance:
- Have extra thin depletion region.
Use/Application:
- It is maintains a specific voltage across it's terminals within given limits of line or load change.
Polarized Capacitor
Actual/Physical Appearance:
- Has insulating sleeves and terminal leads.
Use/Application:
- It is used for noise filtering or decoupling in power supplies.
Light Emitting Diode
Actual/Physical Appearance:
- Has epoxy dome lens, lead frame, bonding wire, anode, and cathode.
Use/Application:
- Illuminations, indicators, automitive uses, sign applications, sensor applications, LED signals and mobile applications.
PNP Transistor
Actual/Physical Appearance:
- Has three terminals namely collector, base, and emitter.
Use/Application:
- It is used as switches.
- It is also used in the amplifiers.
Battery
Actual/Physical Appearance:
- Has energy cell case sizes such as A, C, AA, CR2, and N.
Use/Application:
- It is used to power things like wall clock, remotes, flashlight, mobile phones, weight scales, and etc.
Variable Capacitor
Actual/Physical Appearance:
- Has rotor, shaft, and stator.
Use/Application:
- It is often used in ciruits to tune a radio.
Potentiometer
Actual/Physical Appearance:
- Has three terminals and control shaft.
Use/Application:
- It may be used as a voltage divider.
- It is commonly used to audio control devices.
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