## Conceptual Physics (12th Edition)

Use the transformer relationship. $$\frac{primary \; voltage}{\# \; of \; primary \; turns} = \frac{secondary \; voltage}{\# \; of \; secondary \; turns}$$ $$\frac{120 V}{\# \; of \; primary \; turns} = \frac{24 V}{\# \; of \; secondary \; turns}$$ $$\frac{120 V}{24 V} = \frac{\# \; of \; primary \; turns }{\# \; of \; secondary \; turns}$$ There are 5 times as many primary turns as there are secondary turns.