What is the voltage output of a transformer with a 500-turn primary and a 1500-turn secondary when 120 VAC is applied to the primary?

Explication

The voltage ratio follows the turns ratio: 120 × (1500 / 500) = 120 × 3 = 360 volts. Dividing instead of multiplying gives the 40-volt distractor, which would be the step-down case.