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

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

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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. (a) (d)L Fig. 5-1 Basic RLC circuits under the influence of dc or ac. 51 52 BASIC ELECTRONICS The action resulting from the influence of different components occurs at different times and is represented by simple graphs. Fig. 5-1(a), (b), and (c) are explained in previous chapters.

When this state of equality exists, current ceases to flow. The capacitor is then said to be charged and blocks any further current flow. This charging process does not occur instantly but follows a pattern as represented by the graph in Fig. 4-3(a). This shows that a transit period of time exists before the capacitor becomes fully charged. Voltage Voltage Across C Voltage Voltage Across C time Discharge of C (b) Fig. 4-3 (a) & (b) Graphs of the rise and decay of the charge on a capacitor. Now open switch 1.

T h a t is n -XL - 2nfL _ ωΐ V " R " R R In the equation, X^ is affected by frequency, therefore Q is affected by frequency. " Resistance in wire consumes power (P = I2R) while inductive reactance is an apparent power expressed by P = I2X£. It is apparent power because no energy actually is consumed. If a coil has no resistance then the power used to produce the magnetic field is completely returned to the circuit when the magnetic field collapses; therefore, the power is merely borrowed and returned giving rise to the term apparent power.

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