Hawkins Electrical Guide v. 07 (of 10) Questions, Answers, & Illustrations, A progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications

The facility with which alternating current can be transformed from one voltage to another, thus permitting high pressure transmission of electric energy to long distances throu...

The relation of the virtual value of an alternating current to the other values is shown in fig. 2,491. When the current follows the sine law, the square root of the mean square...

In any electric installation there must be provided a number of automatic devices to secure proper control. The great multiplicity of devices designed for this purpose may be di...

~Air Gap Arresters.~--method of relieving any abnormal pressure condition is to connect a discharge air gap between some point on an electric conductor and the ground. The resis...

~Regulation of Alternators.~--Practically all the methods employed for regulating the voltage of direct current dynamos and circuits, are applicable to alternators and alternati...

~Synchronous Condensers.~--A synchronous motor when sufficiently excited will produce a leading current, that is, when over excited it acts like a great condenser, and when thus...

_Since the electric current cannot be_ ~stopped instantly~ _when the circuit in which it is flowing, is broken_, ~an arc is formed~ _as the switch contacts separate_; this tends...

For the proper control of the alternating current in any of the numerous systems described in the previous chapter, various devices, which might be classed as "auxiliary apparat...