What are the advantages of the null-point method in a Wheatstone bridge? What additional measurements would be required to calculate R unknown by any other?
The main advantage in Wheatstone Bridge is that at null point current does not flow in arm of the galvanometer, so no effect of the resistance of galvanometer or no consumption of electric energy or potential across galvanometer. It is a convenient and easy method. We can calculate the unknown resistance by Ohm’s law in which we need to calculate the least counts and reading of ammeter and voltmeter. Unknown resistance can also be calculated by applying Kirchhoff’s laws to the circuit in which unknown resistance is connected. Here we have to measure the currents and potential differences across all components of the circuit which makes the method difficult.
