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Can anyone help with transformer calculation please

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david7 | 12:32 Sun 18th Mar 2012 | Science
7 Answers
stuck on last question ;-(
A transformer delivers a power of 5Kw when on load, what will be its efficiency if the copper loss is then 100w and the iron loss is 75w.

Thanks in advance

David
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I know nothing about transformers but I would make ane ducated guess that the total loss is 175W which is 3.5% of 5000w; therefore the efficiency is 96.5%
I would do that as 5000/5175
Maybe, but I decided it was 5000 initially because it says "...if the copper loss is THEN 100w"
Question Author
Thanks for the help, looking at my notes think the calculation is V2.I2cos squared ;-( still cant do it
( P out / P in ) * 100 = P efficiency %

http://nuclearpowertr...v4/css/h1011v4_56.htm
Any formula with phase angle would require information about the power factor of the load. You don't have that. Efficiency is just the simple formula as given by others.
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Thanks for your help everyone ;-)

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