KCET2014PhysicsMathematics in Physics
A step down transformer has ( 50 ) turns on secondary and ( 1000 ) turns on primary winding. If a transformer is connected to ( 220 ~V 1 AA ).C. source, what is output current of the transformer?
Options
- A( 1 20 A )
- B( 20 ~A )
- C( 100 ~A )
- D( 2 ~A )
Correct answer
B. ( 20 ~A )
Step-by-step solution
Given, number of turns on secondary, N_ s =50 ; number of turns on primary, N_ P =1000 ; source voltage =220 ~V ; current =1 ~A . We know N_ s N_ p = V_ s V_ p = I_ p I_ s Therefore N_ s N_ p = I_ p I_ s I_ s = N_ p N_ s I_ p Substituting the values, we get I_ s = 1000 50 1=20 ~A Thus, output current of transformer =20 ~A