Question

Heating effect in the Wheatstone bridge can be avoided by _________

(a) using an expensive emf source

(b) limiting current to a safe value

(c) using heating sinks

(d) immersing the setup in ice

The question was asked in semester exam.

This intriguing question comes from Measurement Errors in a Wheatstone Bridge in section Measurement of Resistance of Electrical Measurements

Answer 1

Right option is (b) limiting current to a safe value

For explanation I would say: Heating effect can be eliminated by limiting the current through the circuit to a safe value and by calculating the power dissipation in the arms. Heat sinks are typically used in power electronic applications.