Question

When current passes through the resistances in the Wheatstone bridge what happens?

(a) voltage drop occurs

(b) null detector burns

(c) back emf is induced

(d) temperature increases due to power dissipation

The question was posed to me in final exam.

I would like to ask this question from Measurement Errors in a Wheatstone Bridge topic in section Measurement of Resistance of Electrical Measurements

Answer 1

The correct option is (d) temperature increases due to power dissipation

To explain: Current flow through the resistances causes power dissipation i.e. I^2R leading to an increase in the temperature. As the bridge consists of pure resistances, there is no back e.m.f induced.