Number of windings for 120-V household circuit?

  • Thread starter a1densmom
  • Start date
  • #1
8
0
A model train requires 6 V to operate. If the primary coil of its transformer has 240 windings, how many windings should the secondary have if the primary is connected to a 120-V household circuit?


V1/V2 = N1/N2



my teacher went over this with the class, and said that N2= 6V/120V(240), so it equals 12. I don't get how he got that answer. Can someone help me to understand please?
 

Answers and Replies

  • #2
marcusl
Science Advisor
Gold Member
2,792
451
He is correct. This type of transformer is sometimes called a stepdown transformer because it transforms a big voltage to a smaller one. The turns ratio equals the desired voltage ratio, so
n2/240 = 6/120
and n2=12 as claimed.
 
  • #3
8
0
I see. Thank you. For some reason, how you wrote it, it clicked in my head.
 
  • #4
marcusl
Science Advisor
Gold Member
2,792
451
You're welcome!
 

Related Threads on Number of windings for 120-V household circuit?

  • Last Post
Replies
9
Views
2K
  • Last Post
Replies
4
Views
9K
Replies
7
Views
3K
Replies
4
Views
486
  • Last Post
Replies
2
Views
2K
Replies
7
Views
414
Replies
5
Views
840
Replies
3
Views
6K
  • Last Post
Replies
2
Views
1K
Top