Alternating-current Measuring Instruments ; Watt-hour Meters ; Voltage Regulation of Alternating-current Circuits ; Electric Lamps ; Electric Heating ; Local Distribution of Electrical Energy ; Long-distance Transmission of Electrical Energy ; Line Calculations ; Interior Wiring ; Sign WiringInternational Textbook Company, 1915 - Electric apparatus and appliances |
Common terms and phrases
adjusted alternating current alternating-current ammeter ampere-hour amperes arc lamps armature arranged brush bulb cable candle candlepower carbon lamps cause cent circular mils conductors connected copper cost current coils cut-out device diameter direct current direct-current disk distribution ducts efficiency electric electrodes electromotive force energy feeders feet filament fixture flasher flux four-wire furnace fuses heat incandescent lamp inch increased indicated induction installed insulation iron kilowatts light line wires load magnet mains metal method motor multiple National Electric Code nected neutral number of lamps obtained operating panel pole polyphase position potential circuit potential coil power factor reactance reflector regulation resistance resistor rheostat rigid conduit rotating screen secondary shown in Fig shunt single-phase supply switch Table temperature terminals three-phase three-wire three-wire system transformers tube tungsten lamps two-phase two-wire units usually voltage drop voltmeter volts watt-hour meter wattmeter watts winding wire
Popular passages
Page 42 - When the number is greater than 1, the characteristic is positive, and is one less than the number of figures to the left of the decimal point...
Page 42 - In this system the logarithm of a number is the power to which 10 must be raised to equal the number.
Page 35 - Soldering Fluid. — The following formula for soldering fluid is suggested: Saturated solution of zinc chloride 5 parts Alcohol 4 parts Glycerine 1 part 10.
Page 4 - The field coils carry the main current, or a fixed part of it, and the current in the armature is proportional to the voltage of the...
Page 4 - It will be seen from the above definition that the specific heat of a substance is the ratio between the amount of heat required to raise the temperature of the substance 1°, and the amount of heat required to raise the temperature of the seme weight of water 1°.
Page 61 - Varying speed motors are motors in which the speed varies automatically with the load, decreasing when the load increases, and vice versa. It does not mean motors in which the speed is varied by the use of different windings or groupings of windings, or motors in which the speed is varied by external means, and in which. after adjusting to a certain speed, the speed remains practically constant.
Page 4 - This loss or drop due to resistance is directly proportional to the length of the conductor and inversely proportional to its area of cross-section.
Page 42 - The whole-number part of a logarithm (to the left of the decimal point) is called the characteristic, and the fractional part (to the right of the decimal point) is called the mantissa.
Page 55 - The motor leads or branch circuits must be designed to carry a current at least 25 per cent, greater than that for which the motor is rated. Where the wires under this rule would be overfused in order to provide for the starting current, as in the case of many of the alternating current motors, the wires must be of such size as to be properly protected by these larger fuses.
Page 9 - Between receptacles more than one foot, but less than two feet apart, an additional noncombustible, non-absorptive insulator maintaining a separation and spacing equivalent to the receptacles must be used. Except as above...