Engine

An engine is a machine that converts energy stored in one form into usable mechanical motion. The fundamental principle involves harnessing a source of energy—which may be chemical potential energy (such as in internal combustion engines), electrical energy, or thermal energy—and converting it into kinetic energy. These devices are classified based on their operational principles, including reciprocating engines that utilize linear movement to create rotational force, and electric motors that employ electromagnetic principles. The efficiency and power output of an engine depend on the conversion cycle utilized and the physical laws governing energy transfer, making them critical components in various fields ranging from transportation to industrial power generation.