An Introductory Textbook of Electrical Engineering |
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Common terms and phrases
accordingly alternating currents alternating-current ammeter ampere-hour amperes armature conductors armature current armature winding brushes bus bars capacitance capacity cent central station CHAPTER charge circuit-breaker coil commutator connected copper counter-electromotive force current flows curve delivered direct currents direct-current discharge distribution dynamo effective value efficiency elec electrical energy Electrical Engineers electrolyte electromotive force equal equation field winding flux density frequency full load fuse gausses heat increases induction motor instantaneous values insulation iron kilowatt-hour lead storage losses machine magnetic circuit magnetic field magnetic flux magnetomotive force mains maximum ohms operation output path phase plates polyphase potential power factor practice reactance resistance rheostat rotating rotor secondary series motor shown in Fig single-phase sinusoidal stator storage battery storage cell supply switch synchronous motor synchronous speed terminal voltage three-phase tion torque transformer transmission varies vector diagram voltmeter volts watt-hour meter watts wave-form wire
Popular passages
Page 15 - As a unit of resistance, the international ohm, which is based upon the ohm equal to io9 units of resistance of the CGS system of electro-magnetic 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 grammes in mass, of a constant cross-sectional area and of the length of 106.3 centimeters.
Page 151 - O insulation consists of cotton, silk, paper, and similar organic materials when neither impregnated nor immersed in oil.
Page 14 - The unit of current shall be what is known as the international ampere, which is onetenth of the unit of current of the centimeter-gramsecond system of electro-magnetic units, and is the practical equivalent of the unvarying current, which, when passed through a solution of nitrate of silver in water in accordance with standard specifications, deposits silver at the rate of one thousand one hundred and eighteen millionths of a gram per second.
Page 17 - The volt, which has the value 10s in terms of the centimetre, the gramme, and the second of time, being the electrical pressure that if steadily applied to a conductor whose resistance is one ohm will produce a current of one ampere, and which is represented by -6974 (•}•$$) of the electrical pressure at a temperature of 15° C. between, the poles of the voltaic cell known as Clark's cell set up in accordance with the specification appended hereto, and marked B.
Page 151 - Inorganic materials such as mica and asbestos in built-up form combined with binding substances. If Class A material is used in small quantities in conjunction for structural purposes only, the combined material may be considered as Class B, provided the electrical and mechanical properties of the insulated winding are not impaired by the application of the temperature permitted for Class B material. (The word impair...
Page 165 - ... is the square root of the average value of the squares of the successive values as observed by means of the contact-maker.
Page 336 - Generation and the various reports of the Prime Movers Committee of the National Electric Light Association...
Page 5 - Line in a magnetic or electrostatic field such that its direction at every point is the same as the direction of the force which would act on a small positive charge (or pole) placed at that point; also...
Page 117 - MILLIVOLTMETERS A millivoltmeter consists of a coil of wire suspended between the poles of a permanent magnet so that the coil is free to move. A pointer is attached to the coil and moves over a scale graduated in millivolts or in degrees. Leads from the thermocouple are connected to the terminals of the Coil usually through a series resistance, and the emf generated in the thermocouple circuit...
Page 49 - The pulley on an engine shaft is 5 feet in diameter, and it makes 100 revolutions per minute. The motion is transmitted from this pulley to the main shaft by a belt running on a pulley, and the difference in tension between the tight and slack sides of the belt is 1 15 Ibs.