## Conceptual Physics (12th Edition)

Use the transformer relationship. $$\frac{primary \; voltage}{\# \; of \; primary \; turns} = \frac{secondary \; voltage}{\# \; of \; secondary \; turns}$$ $$\frac{120 V}{100 turns} = \frac{secondary \; voltage}{10 turns}$$ The secondary voltage is 12 V.