In the 8th century, a priest in Lanciano, Italy was experiencing doubts about the real presence of Jesus in the Eucharist. In the middle of saying Mass, he said the words of consecration (âThis is my body,â âThis is my blood) and saw the bread and wine transform into real human flesh and blood.
Energy is usually defined as the ability to do work. This is an anthropocentric and utilitarian perspective of energy; however, it is a useful definition for engineering where the aim of machines is to convert energy to work.
Energy is commonly defined as the capacity of a system or a body to do work. There are many forms of energy (to be described later), but any of them can be used to do work. For example the chemical energy in gasoline can be burned in an automobile engine to make the car move. Electrical energy can be used to turn a motor and make machinery move.