Electricity generators are devices that use the mechanical energy produced from an external source and transform that mechanical energy into electricity. The energy source that these standalone machines use is usually some sort of fuel, such as gas, propane or coal and they vary in size from very small, portable units to generators that are of the size of a small house and are used for supplying power to facilities where it is essential to have continuous energy supply, such as hospitals. Skilled electricians in Denver will tell you it is good to have a back up in the case the electricity goes out.
The most important components of generators is the fuel system that contains and transfers the external energy source, the engine that uses the external power source to generate energy that is transformed into electricity, the alternator that handles the process of transforming the mechanical energy into current, the voltage regulator that makes sure the voltage produced is suitable for being used by the consumers connected to the generator and the systems responsible for the cooling and the lubrification of the generator and the exhaust system through which the by-products of using the external source of energy are eliminated. Large, complex generators are operated through a separate, usually digital control panel, while smaller, simple units are usually operated with the help of buttons.