efficiency

1. The problem statement, all variables and given/known data

I don’t quite understand how to get the maximum efficiency in a circuit.

Exemple.

4 Volts and 2.0Ω will produce 8 watts with a current of 2.0 amps.
5 Volts and 3.1Ω will produce 8 watts with a current of 1.6 amps.

There are infinitely ways to do so. Also we have an led which has to be connected.

2. Relevant equations
P=UI=I^2*R=U^2/R

3. The attempt at a solution
My intuition says that the first one is more efficient, but the battery will drain faster. I realy want to know how to mix this information together for my circuit.

http://ift.tt/1pX0ZOs

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