What is Electricity?D. Appleton and Company, 1903 - 315 pagini |
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Pagina 39
... circuits , which we obtain to a great extent when we put an armature on a horseshoe magnet . The flow of induction takes place then through the armature , and not through the air . A compass is not affected by a closed magnetic circuit ...
... circuits , which we obtain to a great extent when we put an armature on a horseshoe magnet . The flow of induction takes place then through the armature , and not through the air . A compass is not affected by a closed magnetic circuit ...
Pagina 40
... circuit with a certain resistance . It has a flow analogous to a current . Although this terminology shows that we are study- ing the action from point to point in the substance of a magnet and in the space around it , we must not con ...
... circuit with a certain resistance . It has a flow analogous to a current . Although this terminology shows that we are study- ing the action from point to point in the substance of a magnet and in the space around it , we must not con ...
Pagina 52
... circuit ; less goes in general through the large wires leading to our electric lamps when they are lighted than when they are not lighted . The heating of an electric conductor is proportional to the square of the strength of the ...
... circuit ; less goes in general through the large wires leading to our electric lamps when they are lighted than when they are not lighted . The heating of an electric conductor is proportional to the square of the strength of the ...
Pagina 53
... circuit between Boston and Chicago would mean a great saving of copper , and therefore of money . Twenty - five years ago any speci- men of copper wire would vary in resistance in differ- ent portions of its length by at least 1 per ...
... circuit between Boston and Chicago would mean a great saving of copper , and therefore of money . Twenty - five years ago any speci- men of copper wire would vary in resistance in differ- ent portions of its length by at least 1 per ...
Pagina 55
... circuit . A simple application of Kirchhoff's laws soon solved this difficulty . If many paths are offered to the electric current , it divides itself in a proportional manner among these paths ; for in- stance , if we should consider ...
... circuit . A simple application of Kirchhoff's laws soon solved this difficulty . If many paths are offered to the electric current , it divides itself in a proportional manner among these paths ; for in- stance , if we should consider ...
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Termeni și expresii frecvente
action alternating current apparatus attraction bodies carbon cathode rays centimetres charged circuit coil of wire conductor connected copper copper wire Crookes tube current of electricity detect direction discharge distance dynamo dynamo machine earth effect elec electric current electric spark electric waves electrical energy electrical machine electro-magnetic electro-magnetic waves electro-motive force employed ether excited experiments Faraday fluid galvanometer glass gravitation horse power Illustrations inch insulated iron J. J. Thomson lamp Leyden jar lines of force lines of magnetic magnetic force manifestations means measure medium metals method mirror molecular molecules motor movement needle obtained ordinary oscillations oxygen pass phenomena phenomenon photograph pipes placed plate polarization pressure produced Prof refraction resistance revolving Ruhmkorff coil self-induction south pole space spark gap spool steam engine storage battery suitable telephone terminals theory tion to-and-fro currents transformations of energy transmitted tric tricity tube velocity vibrations voltaic cell zinc
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Pagina 302 - ... of our planet, so far as we know it; and nitrogen is very far the predominant constituent of our atmosphere. If the earth is a detached bit whirled off the mass of the sun, as cosmogonists love to tell us, how comes it that in leaving the sun we cleaned him out so completely of his nitrogen and oxygen that not a trace of these gases remains behind to be discovered even by the sensitive vision of the spectroscope...
Pagina 262 - In extending the researches relative to this part of the investigations, a remarkable result was obtained in regard to the distance at which inductive effects are produced by a very small quantity of electricity; a single spark from the prime conductor of the machine, of about an inch long, thrown on the end of a circuit of wire in an upper room, produced an induction sufficiently powerful to magnetize needles in a parallel circuit of wire...
Pagina 199 - Electrical matter differs from common matter in this, that the parts of the latter mutually attract, those of the former mutually repel each other.