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Difficulty: MediumResistors and Potentiometers

Match each type of resistive component to its primary electrical characteristic or circuit application.

  • Metal Film ResistorProvides high precision and minimal electrical noise for sensitive low-power analog circuits.
  • Wirewound ResistorHandles high power dissipation and elevated temperatures using an alloy wire coiled around a ceramic core.
  • PotentiometerUses three terminals with an adjustable wiper across a resistive track to serve as a variable voltage divider.
  • RheostatUses two active terminals connected in series with a load to regulate total circuit current.

Answer

Metal Film Resistor matches with high precision and low electrical noise; Wirewound Resistor matches with high power dissipation and coiled alloy wire construction; Potentiometer matches with three terminals providing an adjustable voltage division; Rheostat matches with two active terminals in series regulating circuit current.
Metal film resistors are characterized by high precision and low electrical noise. Wirewound resistors are characterized by high power dissipation and coiled wire construction. Potentiometers use three terminals to divide voltage, and rheostats use two terminals to adjust current in series.

Step-by-Step Solution

1
Identify the construction and operational profile of fixed resistor types.
Metal film resistors provide low noise and tight precision, whereas wirewound resistors provide high power and heat handling.
Film technologies provide precision at low power, while wound alloy wires allow high wattage dissipation.
2
Distinguish between the terminal configurations of variable resistors.
Potentiometers use three terminals for voltage division, while rheostats use two active terminals for series current limiting.
A three-terminal potentiometer splits an applied voltage across its track, whereas a two-terminal rheostat directly alters total series resistance.
3
Map each component identifier to its exact functional description.
Pairs are established: Metal Film to precision/low noise, Wirewound to high power/ceramic core, Potentiometer to three-terminal voltage divider, and Rheostat to two-terminal current regulator.
Each definition uniquely aligns with the physical and electrical design of the respective component.

Key Concept

Distinguishing construction, terminal configuration, and functional roles of fixed and variable resistive components.
Estimated Time:45s
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Topics

Resistors and Potentiometers

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