Converting heat to work

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Carnot effectiveness Carnot.jpg
Mechanical work or electricity can be converted into heat, but the converse .

In practice, the efficiency of converting heat into mechanical work or into electricity is , and often of the order of 20 to 30%, the rest of the initial heat energy being found in the form of .

The of converting heat into work is called . It depends on the of the hot source Th and that of the cold source Tc.