Industrial Electricity, Part 2McGraw-Hill book Company, Incorporated, 1925 - Electric engineering |
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Common terms and phrases
3-phase alternating current alternating-current ammeter ampere-turns amperes angle armature axis capacitance circuit containing coil current coil voltage condenser conductor connected in series core current and voltage current flows current lags current vector current-coil cycles per second differ in phase direct current direct-current disc effective values electrical energy equal equation example Example.-A Figure flux frequency Hence I₁ increase induced e.m.f. induction motor instant lamps line current line voltage load current machine magnetic field maximum value method negative obtained ohms operating ordinate parallel polyphase polyphase systems positive potential-circuit power curve power taken primary radians reactance resistance resultant right-hand rule rotating field rotor secondary series circuit short-circuit shown in Fig shows sine curve single-phase slots per pole space-degrees speed stator synchronous motor tance terminal voltage three coils torque total power transformer unity power-factor vector diagram vector sum voltage and current voltmeter volts wattmeter watts winding wire Y-connected Y-system zero
Popular passages
Page 408 - In any triangle the square of any side is equal to the sum of the squares of the other two sides minus twice the product of these two sides and the cosine of their included angle.
Page 406 - Radians: 1 radian is the central angle subtended by an arc equal in length to the radius of the circle.
Page 76 - This projected motion, again, may be resolved into two components at right angles to each other.
Page 62 - Between a and b, and between c and d, voltage and current are in opposition, and the power is negative. Between b and c, and between d and e, the voltage and current are in conjunction, and the power is positive.
Page 190 - As this flux <t> is the same for each of the two windings it must induce the same emf. per turn in each winding. The total induced emf. in each winding must then be proportional to the number of turns in that winding. That is, Ei Nl W^N2 (45) where EI and E2 are the primary and secondary induced emfs.
Page 191 - In the ordinary transformer, the terminal voltage differs from the induced emf. only by a very small percentage, so that for most practical purposes it may be said that the primary and secondary terminal voltages are proportional to the respective number of turns.) The...
Page 84 - H at the top of the instrument which acts on the coil through the spring. The angle by which it is necessary to turn this head is proportional to the turning moment of the coil. The turning moment is proportional to the product of the current in the fixed coil and the current in Fio.
Page 57 - The positive terminal of the voltmeter must be brought in contact with the positive terminal of the battery, and the negative terminal of the voltmeter with the negative terminal of the battery.
Page 410 - NATURAL SINES AND COSINES NOTE: For cosines, use right-hand column of degrees and lower line of tenths. Deg. °0.0 °0.1 °0.2 °0.3 °0.4 °0.5 °0.6 °0.7 °0.8 °0.9...
Page 65 - The current in an alternating-current circuit is directly proportional to the voltage across the circuit and inversely proportional to the impedance of the circuit. That is, if the voltage in volts be divided by the impedance in ohms, the value of the current is obtained in amperes.