Which resistance value must remain constant to determine an unknown resistance using the Wheatstone bridge?
Understand the Problem
The question is asking about the Wheatstone bridge, specifically which resistance value needs to be kept constant in order to measure an unknown resistance accurately. This involves understanding the functioning of the Wheatstone bridge circuit.
Answer
R1, R2, and R3 must remain constant in a Wheatstone bridge to determine the unknown resistance.
In a Wheatstone bridge, the resistance values R1, R2, and R3 must remain constant to determine the unknown resistance Rx. The bridge is balanced when R1/R2 = R3/Rx, enabling accurate determination of Rx.
Answer for screen readers
In a Wheatstone bridge, the resistance values R1, R2, and R3 must remain constant to determine the unknown resistance Rx. The bridge is balanced when R1/R2 = R3/Rx, enabling accurate determination of Rx.
More Information
A Wheatstone bridge is used to precisely measure an unknown resistance by balancing the circuit. The balance condition, where no current flows through the galvanometer, provides an equation used to solve for the unknown resistance.
Tips
A common mistake is neglecting the balance condition of the bridge, leading to incorrect calculations.
Sources
- Wheatstone Bridge Circuit and Theory of Operation - electronics-tutorials.ws
- Find all resistor values in the Wheatstone bridge - Physics Forums - physicsforums.com
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