Exercises in Electrical and Magnetic MeasurementLongmans, Green, and Company, 1884 - 189 páginas |
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20 centimetres additional resistance amount of heat ampère angular Answer axis bar magnet battery bound charge C.G.S. unit C₁ C₂ capacity centi centimetres long centimetres radius centre circuit coil collecting plate condensing plate connected copper wire cubic centimetres Daniell's cell difference of potential disc dynes earth's magnetic force electrical density electromagnetic units electromotive force equal ergs extrapolar resistance Find the resistance Find the strength grammes Grove's cells heat developed horizontal intensity inertia iron wire joule last Example Leyden jar lines of force magnetic field magnetic meridian magnetic moment magnetic pole microhms microvolts milliampères milligrammes millimetre minute moment of inertia multiple arc nearly needle Ohm's law ohms resistance placed plane platinum R₁ resistance per cubic right angles ring shunt small magnet specific resistance sphere square centimetres strength of current tangent galvanometer thick torsion balance torsion head turns of wire twist V₁ vertical volt voltameter volts zinc
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Página vi - IN physical science a first essential step in the direction of learning any subject, is to find principles of numerical reckoning, and methods for practicably measuring, some quality connected with it. I often say that when you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind...