JEE Main201910 Apr 2019Morning ShiftPhysicsAlternating CurrentActual
A transformer consisting of 300 turns in the primary and 150 turns in the secondary gives output power of 2.2 k W . If the current in the secondary coil is 10 A , then the input voltage and current in the primary coil are:
Options
- A440 V and 20 A
- B220 V and 20 A
- C440 V and 5 A
- D220 V and 10 A
Correct answer
C. 440 V and 5 A
Step-by-step solution
Assuming 100% efficiency, V 2 V 1 = i 1 i 2 = N 2 N 1 i 1 i 2 = N 2 N 1 i 1 10 = 150 300 i 1 = 5   A P = V I 2200 = 5 × V 1 V 1 = 440   V