Chapter 37, Problem 38A

Why can a hum often be heard when a transformer is operating?

To determine

To Explain: The reason for hearing hum sound during the working of a transformer.

Explanation of Solution

Introduction:

A transformer is a device used for increasing or decreasing the voltage through electromagnetic induction.

Due to alternating current, the magnetic flux in the transformer will keep reversing or alternating its polarities. Hence, in the core of the transformer, the vibrations producing the same frequency by the iron slabs which can be heard as a humming noise.

Conclusion:

The humming noise is heard due to vibrations caused in the core of the transformer.