Basic Electronics by Harold D. Holbrook and Walter J. Seeley (Auth.)

By Harold D. Holbrook and Walter J. Seeley (Auth.)

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Up to many millions of hertz. The currents which flow under the influence of this type of voltage are affected very markedly by the values of the three parameters R, L, and C, and the total influence is encompassed in one parameter, called impedance, represented by the letter Z. In a direct current circuit, Ohm's law is written as I=E/R, but in an alternating current circuit it is written as I=E/Z. By inspecting the basic components under the following circuit conditions, basic relations are derived.

Each dielectric material has its own advantages and disadvantages. Cost must always be considered; tolerances of temperature and pressure also must be considered as factors which affect both the dielectric and the plate material. Space is still a design problem which always exists, but the operating voltage range is the most important factor when a choice of dielectric material must be made. Every dielectric material has its own maximum breakdown voltage below which it must be operated. This maximum point usually occurs just before flash-over or spark-over.

Resistance (R) is not a function of time, therefore, this may be used as a reference in relation to time. In Fig. 5-1(d) Ohm's law,E = IR, applies. When E is maximum then / is maximum at the same instant of time. When referring to ac conditions the sine wave, illustrated in Fig. 5-2, will be used unless otherwise specified. Current and Voltage (a) For Pure Resistance Current and Voltage (b) For Pure Inductance Current Lags 1 1 Current and Voltage // // "Q. > 03 3 F < 1 f1 I \ ^ \ v \ \\ \ l // / ►Time N v_.

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