# Transformer

Discussion in 'Homework Help' started by Petrucciowns, Jun 20, 2009.

1. ### Petrucciowns Thread Starter Active Member

Jun 14, 2009
62
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http://i40.tinypic.com/293ufj9.jpg

Again I am making notes of my past homework assignment and am stuck on two of the questions. So can anyone help me figure out how to find PPR1 and IPR1? I have the answers, I just need to know how to find them out.

Thanks!

Last edited: Jun 20, 2009
2. ### mik3 Senior Member

Feb 4, 2008
4,846
63
Find the total power and current in the secondary and then divide them by the turns ratio to find them in the primary.

3. ### Petrucciowns Thread Starter Active Member

Jun 14, 2009
62
0
After spending 20 minutes trying to figure out answers based on your information I realized you were wrong. Instead it is found this way:

PPR1 = The sum of the power in both the secondary and primary sections.
IPRL= PPR1 / voltage across primary.

Thanks for trying though.

4. ### mik3 Senior Member

Feb 4, 2008
4,846
63
For the primary current I am right (it is one way to find it).

For the primary power I got confused. In a lossless transformer the primary power equals the secondary power.