Elementary Lessons in Electricity & Magnetism |
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acid action alternate currents amperes anode armature attracted ball battery capacity carbon cell centimetre charge of electricity chemical circuit coil condenser conductor copper current flows curve deflexion diamagnetic difference of potential direction discharge disk distance dynamo dynes earth earth's magnetism electric force electrified body electromagnet electrometer electromotive-force electroscope electrostatic energy equal friction galvanometer glass rod gramme heat Hence hydrogen induction influence machines instrument insulated internal resistance inversely kathode knob length Lesson Leyden jar light lines of force liquid magnetic field magnetic force magnetic lines magnetic pole magnetic potential measured metal method move N-seeking negative charge Ohm's law ohms opposite kinds oscillations pass piece placed plate platinum polarization produced proportional quantity of electricity repelled repulsion rotating round rubbed spark sphere square steel strength substances sulphate surface tangent tion torsion balance touched tricity tube turns volts wire zinc
Popular passages
Page 574 - As a umt of resistance, the international ohm, which is based upon the ohm equal to 109 units of resistance of the Centimetre-Gramme-Second 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 106-3 centimetres.
Page 627 - The Electrical Researches of the Honourable Henry Cavendish, FRS Written between 1771 and 1781, Edited from the original manuscripts in the possession of the Duke of Devonshire, KG, by J. CLERK MAXWELL, FRS Demy 8vo. cloth, iSs. Hydrodynamics, a Treatise on the Mathematical Theory of Fluid Motion, by HORACE LAMB, MA, Professor of Mathematics in the University of Adelaide.
Page 318 - Would not these pointed rods probably draw the electrical fire silently out of a cloud before it came nigh enough to strike, and thereby secure us from that most sudden and terrible mischief...
Page 575 - As a unit of quantity, the international coulomb, which is the quantity of electricity transferred by a current of one international ampere in one second. As a unit of capacity, the international farad, which is the capacity of a condenser charged to a potential of one international volt by one international coulomb of electricity.
Page 579 - ... silicate, and leaving it to harden. " The cell thus set up may be mounted in any desirable manner. It is convenient to arrange the mounting so that the cell may be immersed in a water bath up to the level of, say, the upper surface of the cork.
Page 575 - 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.
Page 575 - 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 578 - The crystals should be dissolved with the aid of gentle heat, but the temperature to which the solution is raised should not exceed 30° C.
Page 318 - ... a wire down the outside of the building into the ground, or down round one of the shrouds of a ship, and down her side till it reaches the water?
Page 236 - Tuscany that when a portion of muscle of a frog's leg, hanging by a thread of nerve, bound with silver wire, was held over a copper support so that both nerve and wire touched the copper, the muscle immediately contracted.