thermodynacis
What is are carnot engines? It's essential parts and also it's working mechanism please..

Carnot engine is an imaginary engine. Its is use as reference for find the maximum efficiency of engine working between the Source temperature and Sink (atmosphere) temperature.
Its working part are cylinder and piston and source and sink.

What is the logic behind maximum power transfer theorem? Why should maximum power is to be delivered if the load resistance is equal to the internal resistance of the circuit?