A transformer consists of a 705-turn primary coil and a 2757-turn secondary coil.If the current in the secondary is 1.11 A,what is the primary current?
A) 0.28 A
B) 2.20 A
C) 4.34 A
D) 1.11 A
E) 0.56 A

Question

A transformer consists of a 705-turn primary coil and a 2757-turn secondary coil.If the current in the secondary is 1.11 A,what is the primary current?
A) 0.28 A
B) 2.20 A
C) 4.34 A
D) 1.11 A
E) ​0.56 A

Quizplus · Accepted Answer

According to the transformer equation, the ratio of the number of turns in the primary to the number of turns in the secondary is equal to the ratio of the primary current to the secondary current. Therefore,

705/2757 = Iprimary/1.11 A

Solving for Iprimary, we get:

Iprimary = (705/2757) x 1.11 A = 0.284 A ≈ 0.28 A (rounded to two significant figures)

Therefore, the correct answer is C, 4.34 A.

A Transformer Consists of a 705-Turn Primary Coil and a 2757-Turn