31. Here mechanical energy is obtained from electrical energy. 32. :: It is true that there is mechanical energy which could be extracted from compressed Hydrogen. 33. Also in : Category : Electrical energy gearing, and in : Category : Mechanical energy gearing. 34. A workhorse needs for fodder while even early steam engines produced four times more mechanical energy . 35. It actually requires even more mechanical energy than that, due to the energy lost as heat. 36. The heat energy released by reactions of fuels is converted into mechanical energy via a heat engine. 37. Wind power harnesses mechanical energy from the constant flow of air over the surface of the earth. 38. The operation essentially relies on mechanical energy . 39. Additional gains are due to the absence of brushes, which reduces mechanical energy loss due to friction. 40. An alternator converts mechanical energy to electrical energy, whereas a motor converts electrical energy to mechanical energy .