# 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

Van Nostrand, 1902 - Electricity - 310 pages

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### Contents

 RELATION OF QUANTITIES 12 GENERAL LAWS OF RESISTANCE 22 ELECTRICAL ENERGY 45 ALTERNATING CURRENTS 66
 WIRING FOR LIGHT AND POWER 98 CHAPTER VII 262 BATTERIES 301 Copyright

### Popular passages

Page 8 - 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 6 - 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 7 - 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 9 - 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 66 - 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 28 - 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 1 - The solar day is the interval between two successive transits of the sun's centre across the meridian of any given place.
Page 68 - ... to the rate of change of the number of lines of force thus enclosed.
Page 80 - 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.