Theory and Calculations of Electrical Circuits, Vol. 1 (Classic Reprint)

When electric power flows through a circuit, we find phenomena taking place outside of the conductor which directs the flow of power, and also inside thereof. The phenomena outside of the conductor are conditions of stress in space which are called the electric field, the two main components of the electric field being the electromagnetic component, characterized by the circuit constant inductance, L, and the electrostatic component, characterized by the electric circuit constant capacity, C. Inside of the conductor we find a conversion of energy into heat; that is, electric power is consumed in the conductor by what may be considered as a kind of resistance of the conductor to the flow of electric power, and so we speak of resistance of the conductor as an electric quantity, representing the power consumption in the conductor. Electric conductors have been classified and divided into distinct groups. We must realize, however, that there are no distinct classes in nature, but a gradual transition from type to type. Metallic Conductors 2. The first class of conductors are the metallic conductors. They can best be characterized by a negative statement that is, metallic conductors are those conductors in which the conduction of the electric current converts energy into no other form but heat.
(Typographical errors above are due to OCR software and don't occur in the book.)

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