Resistors

Passive components[edit]

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.

Resistors[edit]

SMD resistors on the 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.[5]
    • 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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