Download Electrical Engineering Leaflets-Intermediate Grade by Edwin James Houston PDF

By Edwin James Houston

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Electric currents may be classed into three different varieties. ) rent. The continuous current. ) The alternating current. The continuous current has cur- constant direction and magnitude, varying, does not vary periodically. Such currents are generally obtained from thermopiles, voltaic or primary cells, and storage or secondary cells. or, The if pulsatory current uniform but the strength is one in which the direction is varies. many forms in some arc also and of signal telegraphic apparatus, Strictly speaking nearly all light and power circuits.

381 volts. e v is = volts. Since E= e l -{-e2 -f- <. / 4, />5 two , and /' 6, of a^lOgand ,T0ohms, respectively, through leads, each of one ohm. In this case we may substitute for the three resistances in parallel, their equivalent or joint resistance 72, as in what has been already stated in para21 B.

True of glass, on account of its hygroscopic nature, and these insulators are, therefore, not well adapted for use in a moist climate. The advantage of an oil insulator arises from the ance fact that the oil interposes a high resist- path leakage over the surface, dust and moisture settling to the bottom of the oil, leaving a clean to surface. The greater the number of insulators supporting a wire, the greater the number of conducting paths for the escape of current to ground, and hence the greater the Therefore, the greater the length of conductleakage.

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