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alternating current ammeter ampere hours antenna armature current armature winding battery brushes candle-power capacity carbon cell cent centimeters charge commutator condenser conductor constant core current flowing curve decrease deflection detector difference of potential direct current direction dynamo efficiency electric electrodes electrolyte electromagnet electromotive force energy equal equation external circuit field resistance frequency galvanometer heat impressed E. M. F. increase induced E. M. F. inductance inductors instrument insulation internal resistance iron lamp lines of force load loss machine magnetic circuit magnetic field maximum measured method motor negative number of turns obtained Ohm's law ohms operation oscillations parallel phase plates positive power factor primary produce reactance receiving circuit represents rheostat ring rotation secondary series field shaft short circuited shown in Fig shunt shunt field spark speed switch temperature terminal voltage tion torque transformer unit varying voltmeter volts watts wave length wire zero
Page 23 - Ampere, which is one-tenth of the unit of current of the CGS system of electromagnetic units and which is represented sufficiently well for practical use by the unvarying current which, when passed through a solution of nitrate of silver in water, in accordance with a certain specification, deposits silver at the rate of 0.001118 of a gramme per second.
Page 500 - An Induction Motor is an alternating-current motor, either singlephase or polyphase, comprising independent primary and secondary windings, one of which, usually the secondary, is on the rotating member. The secondary winding receives power from the primary by electromagnetic induction.
Page 23 - As a unit of resistance, the international ohm, which is based upon the ohm equal to 10" units of resistance of the CGS system of electromagnetic units, and is represented by the resistance offered to an unvarying electric current by a column of mercury at the temperature of melting ice, 14.4521 grams in mass, of a constant cross-sectional area and of the length of 106.3 centimetres.
Page 485 - Cord. — A small cable, very flexible and substantially insulated to withstand wear. There is no sharp dividing line in respect to size between a "cord
Page 485 - The first kind of cable is a single conductor, while the second kind is a group of several conductors. The term "cable" is applied by some manufacturers to a solid wire heavily insulated and lead covered; this usage arises from the manner of the insulation, but such a conductor is not included under this definition of "cable." The term "cable" is a general one and in practice it is usually applied only to the larger sizes. A small cable is called a stranded wire or a cord, both of •which are defined...
Page 476 - Phase. The distance, usually in angular measure, of the base of any ordinate of an alternating wave from any chosen point on the time axis, is called the phase of this ordinate with respect to this point. In the case of a sinusoidal alternating quantity, the phase at any instant may be represented by the corresponding position of a line or vector revolving about a point with such an angular velocity...
Page 500 - Adjustable-speed motors, in which the speed can be varied gradually over a considerable range, but when once adjusted remains practically unaffected by the load, such as shunt motors designed for a considerable range of speed variation.
Page 484 - The regulation of a generator unit, consisting of a generator united with a prime mover, should be determined at constant conditions of the prime mover; ie, constant steam pressure, head, etc. It would include the inherent speed variations of the prime mover. For this reason the regulation of a generator unit is to be distinguished from the regulation of either the prime mover or of the generator contained in it, when taken separately.
Page 480 - Demand Factor: The demand factor of any system, or part of a system, is the ratio of the maximum demand of the system, or part of a system, to the total connected load of the system, or of the part of the system under consideration.