Physics Problem

Question

The 400-turn primary coil of a step-down transformer is connected to an ac line that is 120 V (rms). The secondary coil voltage is 6.50 V (rms).

Calculate the number of turns in the secondary coil

Answer 1

For an ideal transformer the ratio of the secondary voltage to the primary voltage = the ratio of the number of turns in the secondary to the number in the primary.