What is Electricity?D. Appleton & Company, 1896 - 315 pagini |
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Pagina 39
... resistance of the air to the flow of magnetic induction . It is harder to force the flow of magnetic induction through air than through iron or steel . If , for instance , we should cut a horseshoe magnet in two at its bend and then put ...
... resistance of the air to the flow of magnetic induction . It is harder to force the flow of magnetic induction through air than through iron or steel . If , for instance , we should cut a horseshoe magnet in two at its bend and then put ...
Pagina 40
... 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- clude that we have ...
... 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- clude that we have ...
Pagina 51
... to the power house where the source of electricity is situated , we are led to two conclusions : First , that a narrowing or constricting of the conductor , or , in other words , an increase of resistance 5 THE ELECTRIC CURRENT . 51.
... to the power house where the source of electricity is situated , we are led to two conclusions : First , that a narrowing or constricting of the conductor , or , in other words , an increase of resistance 5 THE ELECTRIC CURRENT . 51.
Pagina 52
John Trowbridge. or , in other words , an increase of resistance , leads to a great development of heat and light ; second , that a shortening of the path or a lessening of resistance also leads to a great development of heat . These are ...
John Trowbridge. or , in other words , an increase of resistance , leads to a great development of heat and light ; second , that a shortening of the path or a lessening of resistance also leads to a great development of heat . These are ...
Pagina 53
... resistance of copper and silver to the steady electric current is less than that of any other metals . The resistance of iron is at least six times that of cop- per . A very slight impurity in copper wire exerts a marked increase of ...
... resistance of copper and silver to the steady electric current is less than that of any other metals . The resistance of iron is at least six times that of cop- per . A very slight impurity in copper wire exerts a marked increase of ...
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Termeni și expresii frecvente
action alternating current apparatus attraction body 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 flow 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 tricity tube velocity vibrations voltaic cell zinc
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Pagina 314 - SOUND : a Series of Simple, Entertaining, and Inexpensive Experiments in the Phenomena of Sound, for the use of Students of every age.
Pagina 296 - ... 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 256 - 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 313 - Part I. MECHANICS, HYDROSTATICS, and PNEUMATICS. Part II. HEAT. Part III. ELECTRICITY and MAGNETISM. Part IV.
Pagina 118 - Faraday, in his mind's eye, saw lines of force traversing all space where the mathematicians saw centres of force attracting at a distance : Faraday saw a medium where they saw nothing but distance : Faraday sought the seat of the phenomena in real actions going on in the medium, they were satisfied that they had found it in a power of action at a distance impressed on the electric fluids.