A step - up transformer operates on a 230 V line and a load current of 2 A. The ratio of primary and secondary windings is 1 : 25 . Then te current in the primary is

Options

A. 25 A
B. 50 A
C. 15 A
D. 12.5 A

Answer

B

Explanation

Here, `V_p=230V,I_s=2A,(N_p)/N_s=1/25`
For an ideal transformer , `I_p/I_s=N_s/N_p`
`:. I_p=(N_s/N_p)I_s=(25/1)(2A)=50A`
Thus, the current in the primary is 50 A.