Chapter 7.3, Problem 21R

To determine

To summarize: Steps involved when a transformer changes the voltage of an alternating current.

Explanation of Solution

Introduction:

A transformer is a device used to increase or decrease voltage of the current applied.

The steps involved when a transformer changes the voltage of an alternating current are as follows:

1. Alternating current is passed through primary coil.
2. As current passes through the coil, it acquires a magnetic field. The iron core gets magnetized due to this magnetic field.
3. Since alternating current changes direction at regular intervals, the direction of magnetic field in the iron core changes due to the change in direction of the current.
4. An alternating current is produced in the secondary coil due to changing magnetic field.
5. The current at the input and output alternate at the same frequency.

Conclusion:

A transformer either increases or decreases voltage based upon the number of turns in the primary and secondary coil.