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How do you solve an unbalanced Wheatstone bridge?
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An unbalanced Wheatstone bridge cannot be solved using simple series and parallel circuit analysis because the resistors are connected in a complex configuration. This section provides a step-by-step walkthrough demonstrating how to solve an unbalanced Wheatstone bridge using the mesh current method (also known as the loop current method).
The following unbalanced Wheatstone Bridge is constructed. Calculate the output voltage across points C and D and the value of resistor R4 required to balance the bridge circuit. For the first series arm, ACB. For the second series arm, ADB. The voltage across points C-D is given as:
This is an unbalanced wheat stone bridge. Lets find the correct value of R4 for which it becomes a balanced wheat stone bridge. R1 / R2 = R3 / R4. R4 = ( (R2 / R1) x R3) = (100Ω / 50Ω) x 40Ω = 80 ohms “Ω”. If R4 = 80 ohms, our circuit will become a balanced wheat stone bridge.
Apr 2, 2024 · Unbalanced Wheatstone Bridge. If V OUT in the above circuit is not equal to 0 (V OUT ≠ 0), the Wheatstone is said to be an Unbalanced Wheatstone Bridge. Usually, the Unbalanced Wheatstone Bridge is often used for measurement of different physical quantities like Pressure, Temperature, Strain etc.
If the bridge is unbalanced, the direction of the current indicates whether R2 is too high or too low. At the point of balance, Detecting zero current with a galvanometer can be done to extremely high precision. Therefore, if R1, R2, and R3 are known to high precision, then Rx can be measured to high precision.
