Download Principles and Applications of Electrical Engineering by Giorgio Rizzoni PDF

By Giorgio Rizzoni

The writer does not make clear his issues and leaves to many questions unanswered. This ebook usually says such things as "The worth of flux within the center should be given by way of this equation" with no specifying the place this got here from. he'll additionally mix a number of equations and easily permit the definition of variables to change.

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Example text

17 depicts the representation that will be employed throughout the chapter to denote a generalized circuit element: the variable i represents the current flowing through the element, while v is the potential difference, or voltage, across the element. Suppose now that a known voltage were imposed across a circuit element. The current that would flow as a consequence of this voltage, and the voltage itself, form a unique pair of values. If the voltage applied to the element were varied and the resulting current measured, it would be possible to construct a functional relationship between voltage and current known as the i-v characteristic (or voltampere characteristic).

It is important to realize that, just like voltage, power is a signed quantity, and that it is necessary to make a distinction between positive and negative power. 13, in which a source and a load are shown side by side. The polarity of the voltage across the source and the direction of the current through it indicate that the voltage source is doing work in moving charge from a lower potential to a higher potential. On the other hand, the load is dissipating energy, because the direction of the current indicates that charge is being displaced from a higher potential to a lower potential.

17 depicts the representation that will be employed throughout the chapter to denote a generalized circuit element: the variable i represents the current flowing through the element, while v is the potential difference, or voltage, across the element. Suppose now that a known voltage were imposed across a circuit element. The current that would flow as a consequence of this voltage, and the voltage itself, form a unique pair of values. If the voltage applied to the element were varied and the resulting current measured, it would be possible to construct a functional relationship between voltage and current known as the i-v characteristic (or voltampere characteristic).

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