## Conceptual Physics (12th Edition)

Use the transformer relationship. $$\frac{primary \; voltage}{\# \; of \; primary \; turns} = \frac{secondary \; voltage}{\# \; of \; secondary \; turns}$$ $$\frac{120 V}{\# \; of \; primary \; turns} = \frac{12000 V}{\# \; of \; secondary \; turns}$$ $$\frac{12000 V}{120 V} = \frac{\# \; of \; secondary \; turns }{\# \; of \; primary \; turns}$$ There are 100 times as many secondary turns as there are primary turns.