Electrical Measurements in Practice |
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accuracy adjusted alternating current alternating-current ammeter amperes apparatus armature arranged average bridge Bulletin Bureau of Standards calibrated capacitance cent centimeters commutator condenser conductor connected in series constant continuous current continuous-current corresponding current circuit current transformers curve cycles D'Arsonval deflection detector determined device difference disc dynamometer effect Electric electrodynamometer electrostatic employed energy error fixed coils flux frequency full scale galvanometer hysteresis inductor instru insulation load loss maximum demand measured ment method motor movable coil moving coil moving element moving system mutual inductance non-inductive ohms phase angle pointer polyphase portable position potential circuit potentiometer power-factor principle produced proportional quantity r₁ r₂ ratio resistance resistors rheostat rotating sensitivity shaft shown in Fig shunt single-phase specimen speed standard cell stray fields switch switchboard synchronous temperature tion torque usually vibration voltage voltmeter volts watt-hour meter wattmeter watts wave form Westinghouse Wheatstone bridge winding wire zero
Popular passages
Page 2 - 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 3 - The international ampere is the unvarying electric current which, when passed through a solution of nitrate of silver in water, in accordance with the Specification II attached to these Resolutions, deposits silver at the rate of 0.00111800 of a gram per second.
Page 2 - As a unit of current, the international ampere, which is onetenth 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, and in accordance with accompanying specifications, deposits silver at the rate of 0.001118 of a gramme per second.
Page 2 - A magnet pole is of unit strength when it repels an exactly similar pole at a distance of 1 cm. with a force of 1 dyne.
Page 3 - The international volt is the electrical pressure which, when steadily applied to a conductor the resistance of which is one international ohm, will produce a current of one international ampere.
Page 37 - ... the electromotive force that, steadily applied to a conductor whose resistance is one international ohm, will produce a current of one international ampere...
Page 224 - The demand of an installation or system is the load which is drawn from the source of supply at the receiving terminals averaged over a suitable and specified interval of time.
Page ii - Journal Engineering Record Engineering News Railway Age Gazette American Machinist Signal Engineer American Engjneer Electric Railway Journal Coal Age Metallurgical and Chemical Engineering Power PROBLEMS IN ALTERNATING CURRENT MACHINERY BY WALDO V.
Page 248 - Objectives are discussed in two chapters, one near the beginning and the other near the end of the book.