The voltage leaving the secondary coil of a transformer is equal to 240 V. The secondary coil is wrapped 8 times around the core. The primary coil is wrapped 25 times around the core. What is the initial voltage at the primary coil?

The initial voltage at the primary = 750 V

Explanation:

for a transformer

Es / Ep = Ns / Np

Es = secondary voltage = 240 V

Ep = primary voltage

Ns = number of turns in the secondary=8

Np = Number of turns in the primary=25

so 240/Ep=8/25

Ep=750 V

750 0n edge ...