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In a practical Wheatstone bridge, what is the main source of error?

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Question: In a practical Wheatstone bridge, what is the main source of error?

Options:

  1. Temperature variations
  2. Resistance of the connecting wires
  3. Calibration of the galvanometer
  4. Non-ideal resistors

Correct Answer: Non-ideal resistors

Solution: 

Non-ideal resistors can introduce errors in the measurements due to their tolerance and temperature coefficients.

In a practical Wheatstone bridge, what is the main source of error?

Practice Questions

Q1
In a practical Wheatstone bridge, what is the main source of error?
  1. Temperature variations
  2. Resistance of the connecting wires
  3. Calibration of the galvanometer
  4. Non-ideal resistors

Questions & Step-by-Step Solutions

In a practical Wheatstone bridge, what is the main source of error?
Correct Answer: Non-ideal resistors
  • Step 1: Understand what a Wheatstone bridge is. It is a circuit used to measure unknown resistances.
  • Step 2: Know that the Wheatstone bridge uses four resistors to balance the circuit.
  • Step 3: Recognize that resistors are not perfect; they have tolerances, meaning their actual resistance can vary from their labeled value.
  • Step 4: Learn that temperature can affect resistors, changing their resistance as the temperature changes.
  • Step 5: Realize that these imperfections in resistors can lead to errors in the measurements taken with the Wheatstone bridge.
  • Wheatstone Bridge – A circuit used to measure unknown electrical resistances by balancing two legs of a bridge circuit.
  • Non-ideal Resistors – Resistors that do not behave perfectly according to Ohm's law due to factors like tolerance and temperature variations.
  • Measurement Error – The difference between the measured value and the true value, which can arise from various sources in practical applications.
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