Answers (1)
Energy is not a physical unit. It is a philosophical concept and an accounting technique used to analyze mechanical and chemical exchanges. In nuclear physics it is defined as a wavelength of light, in biology it is a synonym for metabolism, and in public utilities they say energy when they mean connectivity. Anybody who uses the word in any other context either does not know what he is talking about, or is peddling something you don't need.
Electrical appliances use power. A ceiling fan typically has three levels of power: fast, medium and slow. There is no reason to think that two fans might use the same power. You just have to look at the label to see how much power each uses.