Elementary Lessons in Electricity and MagnetismMacmillan, 1918 - 706 pages |
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Common terms and phrases
acid action alternating currents amperemeter amperes anode armature atoms attracted battery cable capacity carbon centimetres charge chemical circuit coil condenser conducting conductor consists copper copper wire core coulombs current flows deflexion dielectric difference of potential direction discharge disk distance dynamo dynes earth electric force electrified electrified body electrolytic electromagnet electrometer electromotive electromotive-force electrons electroscope electrostatic energy equal galvanometer glass gramme heat Hence hydrogen induction influence machine instrument insulated internal resistance inversely ions iron kathode lamp length LESSON Leyden jar light lines of force liquid machine magnetic field magnetic force magnetic lines magnetic pole measured metal motor moving needle negative ohms oscillations pass placed plate platinum polarization positive produced proportional quantity of electricity repelled rotation round self-induction shunt spark sphere square steel strength substances surface tangent galvanometer temperature thin tube turns velocity voltage voltmeter volts watts waves zinc
Popular passages
Page 684 - 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 685 - Now, therefore, His Majesty, by virtue of the power vested in Him by the said Act, by and with the advice of His Privy Council, is pleased to...
Page 685 - The international ampere is the unvarying electric current which, when passed through a solution of nitrate of silver in water, in accordance with the Specification II attached to these Resolutions, deposits silver at the rate of 0.00111800 of a gram per second.
Page 334 - 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...
Page 685 - The unit of electro-motive force shall be what is known as the international volt, which is the electro-motive force that, steadily applied to a conductor whose resistance is one international ohm, will produce a current of an international ampere...
Page 240 - According to it, the equivalent weights of bodies are simply those quantities of them which contain equal quantities of electricity, or have naturally equal electric powers; it being the ELECTRICITY which determines the equivalent number, because it determines the combining force. Or, if we adopt the atomic theory or phraseology, then the atoms of bodies which are equivalents to each other in their ordinary chemical action have equal quantities of electricity naturally associated with them.
Page 347 - The unit difference of magnetic potential exists between two points, when it requires the expenditure of one erg of work to bring a unit magnetic pole from one point to the other against the magnetic forces.
Page 238 - They are combining bodies ; are directly associated with the fundamental parts of the doctrine of chemical affinity ; and have each a definite proportion, in - which they are always evolved during electrolytic action. I have proposed to call these bodies generally ions, or particularly...
Page 250 - 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.
Page 684 - And whereas they have caused the said new denominations of standards to be made and duly verified. Now, therefore, her Majesty, by virtue of the power vested in her by the said Act, by and with the advice of her Privy Council, is pleased to approve the several denominations of standards set forth in the schedule hereto as new denominations of standards for electrical measurement.