Electrical and Magnetic Calculations: For the Use of Electrical Engineers and Artisans, Teachers, Students, and All Others Interested in the Theory and Application of Electricity and Magnetism |
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air gap allow alternating current amp.-turns ampere-turns amperes of current angle approximately armature conductors assuming calculate capacity cells cent circular mils coefficient coil connected constant copper cross section density depth of winding Determine diameter direct current distance dynamo dynes earth's field eddy currents efficiency electrical electromotive force energy ergs EXAMPLE exciting current external resistance feet Find formula frequency gausses gilberts grams heat Hence hysteresis hysteretic inductive drop insulation layers leakage length of wire lines of force load magnetic circuit magnetomotive force mils per ampere motors number of turns obtained oersted per cc Ohm's law ohms permeability pole face power factor primary R₁ R₂ ratio ring secondaries self-induction slots SOLUTION speed square centimeters square inches surface tance temperature total length total reluctance transformers voltage volts W₁ watts watts lost weight Whence width wire wound wrought iron yoke ΙΟ
Popular passages
Page 10 - 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 8 - As a unit of current, the international ampere, which is one-tenth of the unit of current of the CGS system of electro-magnetic 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 accompanying specifications,1 deposits silver at the rate of o.oo1 1 1 8 of a gramme per second.
Page 9 - EMF that cteadily applied to a conductor whose resistance is one international ohm will produce a current of one international ampere, and which is represented sufficiently well for practical use by ] £ || of the EMF between the poles or electrodes of the voltaic cell known as Clark's cell.
Page i - Electrical and Magnetic Calculations, for the use of Electrical Engineers and Artisans, Teachers, Students and all others interested in the Theory and Application of Electricity and Magnetism.
Page 11 - Henry, which is the induction in a circuit when the electro-motive force induced in this circuit is one international volt while the inducing current varies at the rate of one Ampere per second.
Page 68 - Restated, the standard deviation (sigma) is the square root of the mean of the squares of the deviations from the mean of a distribution.
Page 30 - That is, the equivalent resistance of a parallel connected group is equal to the reciprocal of the sum of the reciprocals of the component resistances. Since the conductance of a circuit is the reciprocal of its resistance, the equivalent conductance Go of a parallel group is the sum of the component conductances or — RI G3.
Page 3 - The solar day is the interval between two successive transits of the sun's centre across the meridian of any given place.
Page 70 - ... to the rate of change of the number of lines of force thus enclosed.
Page 82 - A general formulation of the foregoing procedure states that the equivalent resistance of n parallel-connected resistances is the reciprocal of the sum of the reciprocals of the individual resistances.