Electronic component-Passive components-circuit board pcb

- Feb 18, 2017-

Electronic component-Passive components-

circuit board pcb

Passive components

Components incapable of controlling current by means of another electrical signal are called passive devices. Resistors, capacitors, inductors, and transformers are all considered passive devices.


SMD resistors on a backside of a PCB

Pass current in proportion to voltage (Ohm's law) and oppose current.

  • Resistor – fixed value

    • Power resistor – larger to safely dissipate heat generated

    • SIP or DIP resistor network – array of resistors in one package

  • Variable resistor

    • Rheostat – two-terminal variable resistor (often for high power)

    • Potentiometer – three-terminal variable resistor (variable voltage divider)

    • Trim pot – Small potentiometer, usually for internal adjustments

    • Thermistor – thermally sensitive resistor whose prime function is to exhibit a large, predictable and precise change in electrical resistance when subjected to a corresponding change in body temperature.

    • Humistor – humidity-varied resistor

    • Photoresistor

    • Memristor

    • Varistor, Voltage Dependent Resistor, MOV – Passes current when excessive voltage is present

  • Resistance wire, Nichrome wire – wire of high-resistance material, often used as a heating element

  • Heater – heating element

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