Describe the source and the null detectors that are used for a.c bridges
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Ref: https://edurev.in/question/653674/Describethesourceandthenulldetectorsthatar
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AC Bridge
Definition: The bridge uses for measuring the value of unknown resistance,inductance and capacitance, is known as the AC Bridge. The AC bridgesare very convenient and give the accurate result of the measurement.
The construction of the bridges is very simple. The bridge has four arms, one AC supply source and the balance detector. It works on the principle that the balance ratio of the impedances will give the balance condition to the circuit which is determined by the null detector.
General Equation for an AC Bridge
The bridges have four arms, two have noninductive resistance and the other two have inductances with negligible resistance.
When the bridge is in a balanced condition,
The l_{1} and R_{1} are the unknown quantities which are measured in terms of R_{2}, R3, R_{4} and L_{2}. From equation (1) and (2) the following points are concluded.
The ac bridges are also used in other applications likes in the communication system, in complex electronics circuit etc.
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