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Zorluk: OrtaResistors and Potentiometers

A technician connects a digital multimeter across terminal 1 (the counter-clockwise outer terminal) and terminal 2 (the center wiper) of a 10 kΩ10\text{ k}\Omega rotary potentiometer. If the control shaft is rotated fully clockwise toward terminal 3, what resistance value should the multimeter display?

  1. A
    0 Ω0\ \Omega
  2. 10 kΩ10\text{ k}\OmegaCevap
  3. C
    5 kΩ5\text{ k}\Omega
  4. D
    Infinite resistance

Cevap

The multimeter will display the full rated resistance of 10 kΩ10\text{ k}\Omega.
A rotary potentiometer contains a continuous resistive track between two outer fixed terminals (terminals 1 and 3) and a movable wiper contact (terminal 2). When the shaft is rotated fully clockwise toward terminal 3, the wiper moves to the extreme end of the resistive track at terminal 3. Consequently, the multimeter connected across terminal 1 and terminal 2 spans the entire length of the resistive element, displaying the full nominal rating of 10 kΩ10\text{ k}\Omega.

Adım Adım Çözüm

1
Identify the internal construction and terminal functions of a standard three-terminal potentiometer.
Terminal 1 and terminal 3 connect to the opposite fixed ends of the internal 10 kΩ10\text{ k}\Omega resistive strip, while terminal 2 connects to the movable wiper contact.
Understanding the internal layout establishes how rotation alters the length of resistive material between any two terminals.
2
Determine the physical position of the wiper relative to terminal 1 after rotating fully clockwise toward terminal 3.
Rotating clockwise shifts the wiper (terminal 2) all the way to terminal 3, placing the maximum possible distance of the resistive track between terminal 1 and terminal 2.
Electrical resistance is directly proportional to the length of resistive material between the two meter probes.
3
Calculate the measured resistance across terminal 1 and terminal 2.
The meter measures the complete length of the track, indicating 10 kΩ10\text{ k}\Omega.
With the wiper at terminal 3, the resistance between terminal 1 and terminal 2 equals the total nominal resistance of the potentiometer (10 kΩ10\text{ k}\Omega), while the resistance between terminal 2 and terminal 3 drops to 0 Ω0\ \Omega.

Anahtar Kavram

Potentiometer terminal configuration and variable wiper resistance behavior
Tahmini Süre:45s
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Resistors and Potentiometers

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