| 单词 | efficiency |
| 释义 | efficiency A measure of the performance of a machine, engine, etc., being the ratio of the energy or power it delivers to the energy or power fed to it. In general, the efficiency of a machine varies with the conditions under which it operates and there is usually a load at which it operates with the highest efficiency. The thermal efficiency of a heat engine is the ratio of the work done by the engine to the heat supplied by the fuel. For a reversible heat engine (see reversible process) this efficiency is equal to (T1 - T2)/T1, where T1 is the thermodynamic temperature at which all the heat is taken up and T2 is the thermodynamic temperature at which it is given out (see Carnot cycle). For real engines it is always less than this |
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