Electronics Made Simple by George H. Olsen (Auth.)

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By George H. Olsen (Auth.)

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Extra resources for Electronics Made Simple

Sample text

We can see now why the resistance of metallic conductors rises with temperature. Although liquids such as mercury or molten silver, for example, do not possess a crystal structure, the conduction mechanism is very similar to that of solid copper or aluminium. Conduction in chemical solutions is somewhat different. When many salts or acids are dissolved in water they become ionized. For example, common salt, which chemically is called sodium chloride, consists of crystals containing sodium and chlorine atoms.

E. one thousandth of a henry), then by using a ferrite core of the type shown in Fig. 17(b) with a permeability of say 400, the inductance will be increased to nearly 400 mH. We have to say *nearly' because some losses are bound to occur. f. in the second coil, the two coils are said to be induc­ tively coupled. This phenomenon is called mutual induction. The changing magnetic flux is produced in the first or primary coil, by connecting a source of alternating voltage to the coil. Such alternating voltages produce alternating currents in the primary coil.

For a given capacitor, if the charge does not change, the voltage across the capacitor cannot change. So if the voltage on the input terminal of the capacitor suddenly jumps from 0 to V volts then the output terminal must also jump to V volts. What happens thereafter depends upon the values of C and R, and the time the input voltage stays at its positive value. During the time that the input voltage is maintained at a steady value, the voltage across the resistor will drop as the capacitor charges via the resistor.

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