A transformer has a primary coil with 600 turns and a secondary coil

with 300 turns. If the output voltage is 320 volts, what is the input

voltage?

A. 8 volts

B. 150 volts

C. 640 volts

D. 600 volts

Number of turns in the primary Np = 600

Number of turns in the secondary Ns = 300

Output voltage Es = 320 volts

Input voltage Ep = ?

Assuming the transformer to be ideal,

Np/Ns = Ep/Es

Ep/Es = 600/300 = 2

Ep = 320*2 = 640 volts