## The Theory and Practice of Absolute Measurements in Electricity and Magnetism, Volume 2, Issue 2 |

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### Common terms and phrases

action activity adjusted alternating amount ance angle applied arrangement axis balance battery branch calculated capacity carried cell charge circle circuit coil compared comparison conductor connected constant correction curve deflection denote described determined difference of potential direction disk distance effect electric electromagnetic electromotive force electrostatic energy equal equation error experiments expression field flow formula galvanometer given gives greater Hence horizontal increased induction instant integral intensity iron length lines machine magnetic force maximum mean measured ment meter method motor mutual nearly needle observed obtained ohms ordinary passed period placed plane plate position practical produced quantity radius ratio reading resistance round scale shown side speed square standard steady currents supposed surface taken terminals Theory tion turns units vertical vibrator whole 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...