Chapter 37, Problem 13A

How does the relative number of turns on the primary and the secondary coil in a transformer affect the step-up or step-down voltage factor?

To determine

To explain: The effect of the relative number of turns on the primary and the secondary coil in a transformer on the step − up or step − down voltage factor.

Explanation of Solution

Introduction:

In step − up transformers, voltage levels are increased and in step − down transformers, voltage levels are decreased.

Voltage factor through a coil is directly proportional to number of turns of a coil. For step − up transformer, output voltage is more than input voltage. Hence, number of turns in secondary coil is more as compared to primary coil for step − up transformer.

For step − down transformer, output voltage is less than input voltage. Hence, number of turns in secondary coil is less than as compared to primary coil for step − up transformer.

Conclusion:

Secondary coil has relative more turns than primary coil for a step − up transformer.

Primary coil has relative more turns than secondary coil for a step − down transformer.