Could you please work these step by step? These are severalpractice problems I a
ID: 1674465 • Letter: C
Question
Could you please work these step by step? These are severalpractice problems I am struggling with. Thank you in advancefor the help-- will rate lifesaver!1) A transformer quadruples a primary voltage of110v (ac). What is the ratio of the number of turns in itsprimary coil to those in the secondary coil?
A) 4:1
B) 1:4
C) A or B
D) need more info
2) The primary coil of a transformer has 100turns and its secondary coil has 400 turns. If the ac currentin the secondary coil is 2A, what is the current in its primarycoil?
A) 8A
B) 1/2A
C) 4A
D) 2A
E) 1/4A
Explanation / Answer
1) A transformer quadruples a primary voltage of110v (ac). What is the ratio of the number of turns in itsprimary coil to those in the secondary coil?Since Vs = 4Vp = 440V =>Vp/Vs = 1/4 we have: Np / Ns =Vp / Vs = 1/4 answer: B) 1:4
2) The primary coil of a transformer has 100turns and its secondary coil has 400 turns. If the ac currentin the secondary coil is 2A, what is the current in its primarycoil?
since Ns / Np = Ip /Is Ip = (Ns / Np )Is= (400/100)*2A = 8A answer: A) the current in its primary coil is8A Ip = (Ns / Np )Is= (400/100)*2A = 8A answer: A) the current in its primary coil is8A