SUPPLEMENTARY TEXT
Energy Transportation
Energy cannot be created, or destroyed; it is merely converted from one form to another. Mechanical energy can be changed by friction into the heat energy. The energy of explosives is a chemical energy and a muscular energy is derived from the oxidation, or burning of food consumed. Light and radiation represent the energy of motion without transformation of matter.
Each of these kinds of energy can be converted into any other one. When a generator produces voltage, and an electric motor uses the current that flows, as a result, of that, voltage performs work; energy is being transformed from one form to the other. The form that it takes between generator and motor is electrical energy, but the energy turning the generator and the energy doing the job in the electric motor is mechanical energy. Among all forms of energy, electrical energy is the most convenient and versatile. It can be transmitted to far distances, over wires, or sent through the air, as magnetic waves, and converted to electric signals or impulses at the terminal. It can be precisely controlled, from the smallest amounts, up to enormous quantities. It can be changed efficiently into any other form of energy.
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