|Mar6-10, 11:06 AM||#1|
Efficiency of a Transformer
1. The problem statement, all variables and given/known data
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?
2. Relevant equations
P = I * V
V = I * R
3. 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...
|Mar6-10, 11:53 AM||#2|
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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