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wheatstone bridge
Wheatstone bridge is an arrangement of four resistances which can be used to measure one of them in terms of cool. Her path AB and BC are called ratio arm and arms AC and BD are called conjugate arms.
Balanced bridge: The bridge is said to be balanced when deflection in galvanometer is zero i.e. no current goes through the galvanometer or in other words . In the balanced conditionP/Q = R/S, on mutually changing the position of cell and galvanometer this condition will not change.
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Unbalanced bridge: If the bridge is not balanced current will flow from D to B if VD>VB i.e. (VA>VD)< (VA>VB) which gives PS > RQ.
Applications of Wheatstone bridge: Post office box, Meter Bridge and Carey Foster Bridge are instruments based on the principle of Wheatstone bridge and are used to measure unknown resistance.
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METER BRIDGE: In case of Meter Bridge, the resistance line AC is 100 cm size. Defining the position of tapping position B, bridge is balanced. If in balanced position of bridge AB = l,
BC = (100 - l)
So thatQ/P = (100-l)/l.
Also P/Q=R/S => S = (100-l)/l R
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