1 Physics -- Electrical Circuits

5)Why should we not use the Wheatstone bridge for very low resistance?


5)Why should we not use the Wheatstone bridge for very low resistance?


When we use Wheatstone bridge for measuring very low resistance , all the other 

other resistances should also be low to make the circuit sensitive. But, a low 

resistance galvanometer is not so much sensitive. Load resistance

and contact resistances will also make some error in the measurement.

The Wheatstone bridge is not suitable for measuring very low resistance because it is based on a ratio of two resistances, and the resolution of the bridge decreases as the ratio approaches 1. This means that the Wheatstone bridge is not accurate enough to measure very small changes in resistance.

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