A power generator is a device used to generate electricity. It is particularly useful in places where access to the electricity network is limited or in emergency situations where power supply is not available. A power generator converts mechanical energy, usually generated by the combustion engine, into electricity. This transformation takes place by means of a generator that uses the phenomenon of electromagnetic induction. The most common are those with petrol or diesel engines. The choice of engine type depends on many factors, including the required power, fuel availability, operating costs and user preferences. In addition to traditional fuels such as petrol or diesel, some power generators can be fed with natural gas, propane or even biofuels. Power generators can have different sizes and power ratings: from small portable devices with the power of several kilowatts, to large stationary systems with the power of several dozen or even several hundred kilowatts.