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1 A generator converts mechanical energy into electrical energy. 2  A hydroelectric powerplant converts the mechanical energy of water in a storage dam into electrical energy. 3  An internal combustion engine is a heat engine that obtains mechanical energy from chemical energy by burning fuel. A hydroelectric powerplant converts the mechanical energy of water in a storage dam into electrical energy. 2  An internal combustion engine is a heat engine that obtains mechanical energy from chemical energy by burning fuel. 3  From this mechanical energy, the internal combustion engine often generates electricity.
â¢ Mechanical energy is the ordered movement of the molecules as a single unit. Thermal energy is the random movement of the molecules. â¢ Mechanical energy can be 100% converted to thermal energy, but thermal energy cannot be fully converted to mechanical energy. â¢ Thermal energy cannot do work, but mechanical energy can do work. â¢ Mechanical energy has two main forms, namely kinetic energy and potential energy.