Energy Control Systems

One example of an energy control system is the generation, transmission, and use of electricity.  In a coal-fired power plant, the original source of energy is the coal.

From the source, the energy goes through the following conversions:

1. Chemical energy in coal is changed to thermal energy by burning.
2. Thermal energy boils water, which increases the speed of the molecules in the water and produces steam (mechanical energy).
3. Mechanical energy of the steam turns the blades in the turbine (mechanical energy), which generates electricity (electrical energy).

The electricity is then transmitted along power lines to where it is needed, such as in a home.  There the electricity may be used to power motors, operate appliances such as radios and television sets, and provide light and heat.