Question:

A transformer consisting of 300 turns in the primary and 150 turns in the secondary gives output power of 2.2kW. If the current in the secondary coil is 10A, then the input voltage and current in the primary coil are:

440Vand5A

220Vand10A

440Vand20A

220Vand20A

The correct option is B 440Vand5A
Given NP=300, NS=150, P0=2200W IS=10A
P0=V0I0 ⇒ 2200=V0×10 ⇒ V0=220V

Vi/V0=NP/NS ⇒ Vi=2×220=440V
Also P0=ViIi ⇒ Ii=2200/440=5A