Generators refer to mechanical equipment that converts other forms of energy into electrical energy. They were first produced during the Second Industrial Revolution and were made by German engineers Siemens and 1866. Portable generators require generators to be able to move quickly with the movement of people and keep a small size, volume and weight in order to be counted as portable generators. The principle of portable generator is: The gasoline engine drives the generator to run and converts the energy of gasoline into electric energy.