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?

750 0n edge ...

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