Understanding energy flow in electrical power: The system and its state
Energy can be most conveniently described as the capacity to do work. Work in turn can be defined as the energy transferred by a force applied through a displacement. The amount of work done in a given time or the rate of doing work is known as power. Pushing a car on the road by people is a straightforward scenario. But to explain how the energy used in a power station being transferred through out the whole electricity grid until used by its customers is a very complicated process.