- #1
bleedblue1234
- 109
- 0
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...