Engine
ENGINE - an energy machine converting any type of energy into mechanical work. Engines are divided into primary and secondary. Primary engines (hydro-turbines, internal combustion engines, etc.) directly convert the energy of natural resources (water, nuclear fuel, etc.) into mechanical energy. Secondary engines (e.g., electric) receive energy from primary sources, converters and energy storage systems (e.g., solar panels, spring mechanisms, etc.).
Source: "Methodological Recommendations for Conducting Independent Technical Inspection of a Vehicle under Compulsory Motor Third Party Liability Insurance (No. 001MR/SE)" (approved)
NIITAT of the Ministry of Transport of Russia, October 12, 2004; Russian Federation Center for Certification and Standardization under the Ministry of Justice of Russia, October 20, 2004; Central Expertise Center under the Ministry of Internal Affairs of Russia, October 18, 2004; Non-Commercial Partnership "Otek", October 20, 2004)