NEET2014PhysicsAlternating CurrentActual
A transformer having efficiency of 90 % is working on 200   V and 3   k W power supply. If the current in the secondary coil is 6   A the voltage across the secondary coil and the current in the primary coil respectively are:
Options
- A300 V , 15 A
- B450 V , 15 A
- C450 V , 13.5 A
- D600 V , 15 A
Correct answer
B. 450 V , 15 A
Step-by-step solution
Current in primary coil = P V = 3000 200 = 15 A P o u t = η % o f P i n V 2 i 2 = 90 100 × 3000 V 2 6 = 2700 V 2 = 450 v o l t