A transformer has 300 turns of wire in the primary coil and 30 turns in the secondary coil. If the input voltage is 100 volts; the output voltage is?

A. 5 volts
B. 10 volts
C. 15 volts
D. 20 volts

Correct Answer:

Option B – 10 volts

Explanation

For transformation, Es = e.m.f. of secondary coil

Ep = Np

Np = e.m.f. of secondary coil

Ns = number of turns in secondary coil

Ns = number of turns in primary coil

30/300 = x/100 = 300

X = 3000/300

X = 10 volts