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Efficiency of a Transformer

  • #1

Homework Statement



The specifications of a transformer for a small appliance read "Input: 110 V, 6.4 W" and "Output: 8.9 V, 270 mA". What is the efficiency of this transformer?

Homework Equations



P = I * V

V = I * R

The Attempt at a Solution



6.4 W / (8.9*(270*.001)) ---> I think this is wrong

I am just not sure how the voltage drop of the transformer would affect the power output...
 

Answers and Replies

  • #2
12
0
Your reasoning is absolutely correct, voltage drop theoretically shouldn't affect the power output, but in theory we assume that there is no losses, no heat generated etc.
Thus when such a question pops up (power out)*100/(power in ) will give you the efficiency.
 

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