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Question

What is unbalanced bridge?


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Solution

  1. By using variable resistance and a straightforward mathematical formula, the Wheatstone Bridge, a diamond-shaped circuit whose concept was developed by Charles Wheatstone, can be used to precisely measure unknown resistance values or as a method of calibrating measuring instruments, such as voltmeters and ammeters.
  2. The Wheatstone Bridge circuit consists of two straightforward series-parallel resistance configurations connected between a voltage source terminal and ground, which, when balanced, produce zero voltage differential between the two parallel branches. A Wheatstone bridge circuit consists of two input terminals, two output terminals, and four resistors arranged in the recognizable diamond pattern as depicted. This is how the Wheatstone Bridge is typically drawn.

In an unbalanced bridge, the current through the galvanometer Ig0,

Then, PQRS and VBVD,

If PQ<RS, then VB>VD, so current flows from B to D.

If PQ>RS, then VB<VD, so current flows from D to B.


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