The use of energy
 Fred |
 Lilly |
„
Well? Do you already know the reason for the decreasing of the intensity of the lamp?
“
„
Unfortunately, not yet. Even my laptop is working up quite a sweat, its cooling is humming quite loud. Do you hear it, Fred?“
„
Yes, I do. Now I observe it too. Why is it doing so, though?“
„
But why is it heated up at all? It is not at all that it is doing sports.
“