Comparison between Governor and Flywheel.

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Sr.No.	Governor	Flywheel
1.	The function of a governor is to keep the variation in mean speed of the engine within prescribed limits due to fluctuations in load over a period of time.	The function of flywheel is to control the speed variations caused by the fluctuations of turning moment during a cycle.
2.	Mathematically, a governor controls dN.	Mathematically, a flywheel controls.
3.	A governor regulates the speed by regulating the quantity of charge of the prime mover.	A flywheel stores the energy and gives up the energy whenever required during a cycle.
4.	It regulates the speed over a period of time.	It regulates the speed during one cycle only.
5.	A governor takes care of quantity of working fluid.	A flywheel has no control over the quantity of charge.
6.	It is an essential element of a prime mover since it does adjustment of supply of charge according to the load on the engine.	A flywheel is not an essential element for prime mover, it is only used when there are undesirable cyclic fluctuations of energy in output or input.

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