Elementary Lessons in Electricity & MagnetismMacmillan, 1894 - 638 стор. |
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Сторінка 14
... tend to move together , and the space between them is found to be thrown into a peculiar state of stress , as though ... tends to point across from the positively electrified surface to the negatively electrified surface , along ...
... tend to move together , and the space between them is found to be thrown into a peculiar state of stress , as though ... tends to point across from the positively electrified surface to the negatively electrified surface , along ...
Сторінка 18
... tend to close together . If now the brown paper be brought near the electroscope , the leaves will be seen to diverge more , proving the electrification of the paper to be of the same kind as that with which the electroscope is charged ...
... tend to close together . If now the brown paper be brought near the electroscope , the leaves will be seen to diverge more , proving the electrification of the paper to be of the same kind as that with which the electroscope is charged ...
Сторінка 21
... tends to untwist is precisely pro- portional to the amount of the twist . The force required to twist the wire ten degrees is just ten times as great as the force required to twist it one degree . In other words , the force of torsion ...
... tends to untwist is precisely pro- portional to the amount of the twist . The force required to twist the wire ten degrees is just ten times as great as the force required to twist it one degree . In other words , the force of torsion ...
Сторінка 23
... tend not only to draw the two balls together , but also to draw the electrifica- tions on the surfaces of the balls toward one another . Fig . 16 . There is also a lateral pressure in the medium tending to keep the electric lines apart ...
... tend not only to draw the two balls together , but also to draw the electrifica- tions on the surfaces of the balls toward one another . Fig . 16 . There is also a lateral pressure in the medium tending to keep the electric lines apart ...
Сторінка 66
... tend to let off a positive charge against the back , thereby leaving B more negative . In the same way the tongue of A will let off a negatively electrified wind , making A more positive , so building up or accumulating two opposite ...
... tend to let off a positive charge against the back , thereby leaving B more negative . In the same way the tongue of A will let off a negatively electrified wind , making A more positive , so building up or accumulating two opposite ...
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Загальні терміни та фрази
acid action amperes angle attracted ball battery capacity carbon cell centimetre charge of electricity chemical circuit coil condenser conductor copper current flows deflexion diamagnetic dielectric difference of potential direction discharge disk distance dynes earth earth's magnetism elec electric force electrified body electromagnet electrometer electromotive-force electroscope electrostatic equal Faraday field-plates friction galvanometer glass rod grammes heat Hence hydrogen induction influence machines insulated inversely iron kathode knob length Lesson Leyden jar lines of force liquid magnetic field magnetic force magnetic lines magnetic pole magnetic potential measured metal move negative charge ohms opposite kinds particles pass piece placed plate polar positive charge produced proportional quantity of electricity repelled repulsion resistance rotating round rubbed shown in Fig spark sphere square square centimetre steel strength substances surface tangent thin tion torsion torsion balance touched tricity tube turns unit volts wire zinc
Популярні уривки
Сторінка 586 - As a umt of resistance, the international ohm, which is based upon the ohm equal to 109 units of resistance of the Centimetre-Gramme-Sevond 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 grammes in mass, of a constant cross-sectional area and of the length of 100-3 centimetres.
Сторінка 588 - As a unit of work, the joule, which is equal to 107 units of work in the CGS system, and which is represented sufficiently well for practical use by the energy expended in one second by an international ampere in an international ohm. As a unit of power, the watt, which is equal to 10...
Сторінка 591 - ... above the cork, using sufficient to cover completely the zinc and soldering. The glass tube containing the platinum wire should project some way above the top of the marine glue. The cell may be sealed in a more permanent manner by coating the marine glue, when it is set, with a solution of sodium silicate, and leaving it to harden.
Сторінка 587 - The unit of quantity shall be what is known as the international coulomb, which is the quantity of electricity transferred by a current of one international ampere in one second. Fifth. The unit of capacity shall be what is known as the international farad, which is the capacity of a condenser charged to a potential of one international volt by one international coulomb of electricity.
Сторінка 590 - ... temperature, agitating it from time to time, then allow it to cool ; continue to shake it occasionally while it is cooling. Crystals of zinc sulphate should then be distinctly visible, and should be distributed throughout the mass ; if this is not the case, add more crystals from the stock bottle, and repeat the whole process. This method ensures the formation of a saturated solution of zinc and mercurous sulphates in water. To set up the Cell. The cell may conveniently be set up in a small test...
Сторінка 587 - The unit of current shall be what is known as the international ampere, which is onetenth of the unit of current of the centimeter-gramsecond system of electro-magnetic units, and is the practical equivalent of the unvarying current, which, when passed through a solution of nitrate of silver in water...
Сторінка 587 - As a unit of electromotive force, the international volt, which is the electromotive force that, steadily 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 ^2.
Сторінка 590 - C. Keep the paste for an hour at this temperature, agitating it from time to time, then allow it to cool ; continue to shake it occasionally while it is cooling. Crystals of zinc sulphate should then be distinctly visible, and should be distributed...
Сторінка 589 - The Zinc. — Take a portion of a rod of pure redistilled zinc, solder to one end a piece of copper wire, clean the whole with glass paper, carefully removing- any loose pieces of the zinc.