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Why DC motors are not operated to devolop maximum power in practice?
Wiki User
∙ 10y ago
It is almost inevitable that some energy is lost.If the engine produces heat, as in a gasoline engine, there is a theoretical limit - that of the theoretical Carnot engine - which is itself less than 100%. For example, if the ambient temperature is 300 kelvin and the engine works at 900 kelvin, the theoretical efficiency is 66.666... percent. But the real efficiency would be even less than that.
Wiki User
∙ 6y ago
Wiki User
∙ 6y agoThe efficiency of any machine is less than 100% because some of the second law of thermodynamics. In any closed system, some of the energy that is input is lost through friction, radiated as heat, light or noise.
Wiki User
∙ 16y agoAccording to the Second Law of Thermodynamics, no process can be 100% efficient. This goes for everything, including motors converting fuel into kinetic energy.
Wiki User
∙ 12y agoIt depends on the type of moter, but for petrol motors it is safe to assume around 60% efficiency.
Ie. 100Kw input = 60Kw output.
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