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GATE 2026 IN – Question 24

Measurements · Electrical bridges · 1 mark · Multiple choice

The Kelvin double bridge is used to measure ______ valued resistances and has ______ resistors in its construction.

  1. low ; three-terminal
  2. low ; four-terminal
  3. high ; three-terminal
  4. high ; four-terminal

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Correct answer: (B) low ; four-terminal

Explanation

Lead and contact resistances can be comparable to a low resistance being measured. Kelvin’s double bridge separates the current-carrying connections from the voltage-sensing connections by using four-terminal resistors, reducing these errors.

It therefore measures **low-valued resistances using four-terminal resistors (B)**.