The Theory and Practice of Absolute Measurements in Electricity and Magnetism, Volume 2, Issue 2Macmillan and Company, 1893 |
Contents
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Common terms and phrases
adjusted ampere ance arrangement axis B.A. unit balance ballistic battery bobbin C.G.S. units calculated cell centimetres centre circle circuit Clark cell coil condenser conductor constant copper correction curve deflection denote determined diameter difference of potential disk distance effect electric force electrical efficiency electrodynamometer electrolysis electromagnetic electromotive force electrostatic energy equal equation error experiments flow formula Galvano galvanometer give given Hence Hertz horizontal inductor instrument integral iron J. J. Thomson length Lord Rayleigh magnetic force magnetic moment magnetometer mean plane mean radius measured ment mercury meter method metres mirror motor mutual inductance needle number of turns observed obtained ohms Phil placed plate position produced R₁ ratio resistance right angles scale self-inductance shown in Fig spark-gap speed standard steady currents suspended tangent galvanometer temperature terminals Theory tion torsion velocity vertical vibrator Wheatstone bridge wire zero
Popular passages
Page 859 - ... the electromotive force that, steadily applied to a conductor whose resistance is one international ohm, will produce a current of...
Page 857 - 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 858 - Ampere, which is one-tenth 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, in accordance with a certain specification, deposits silver at the rate of 0.001118 of a gramme per second.
Page 711 - Art. 1, it is stated that a current will be induced in a closed coil or circuit when there is a change in the number of lines of force passing through that coil or circuit.
Page 857 - ... as unit of length, the gramme as unit of mass, and the second as unit of time, and that by the terms centimetre and gramme are meant the standards of those denominations deposited with the Board of Trade. (3) " That the standard of electrical resistance should be denominated the ohm, and should have the value 1,000,000,000 in terms of the centimetre and second.
Page 859 - ... amperes is unity. (12) That instruments constructed on the principle of the balance, in which, by the proper disposition of the conductors, forces of attraction and repulsion are produced, which depend upon the amount of current passing, and are balanced by known weights...
Page 858 - ... 10. That an unvarying current which, when passed through a solution of nitrate of silver in water, in accordance with the specification attached to this Report, deposits silver at the rate of 0-001118 of a gramme per second, may be taken as a current of one ampere.
Page 858 - That for the purpose of replacing the standard, if lost, destroyed, or damaged, and for ordinary use, a limited number of copies should be constructed, which should be periodically compared with the standard ohm and with the British Association unit.
Page 700 - Therefore a conductor in a magnetic field, and carrying a unit current which flows at right angles to the lines of force, is acted on by a force tending to move it in a direction at right angles to its length, and the magnitude of this force for unit length of conductor, and unit field, is by the definition of unit current equal to unity. Applying this to our slider in which we may suppose a current of strength...
Page 525 - ... the wire to be such that its resistance is very great in comparison with that of the rest of the circuit, so that, when the slider is moved with any given velocity, the resistance in the circuit remains practically constant. When the slider is moved along the rails it cuts across the lines offeree, and so long as it moves with uniform velocity a constant difference of potentials is maintained between its two ends, and a uniform current flows in the wire from the rail which is at the higher potential...