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air gap alternating current ampere turns required apparatus arc lamp arma armature reaction brush carbon cause cell charge commutator bar conductor connected copper current flows device diagram diameter difference of potential direction discharge dynamo dynamo-electric machine eddy currents elec electric current electric resistance electric source ELECTRIC–A electro-magnet electrolyte electromotive force employed energy field coils field magnet galvanometer Gramme ring heat helix induction insulation leakage light lines of force lines of magnetic load magnet poles magnetic circuit magnetic field magnetic flux magnetic force magnetic lines magnetic needle magnetizing coil metal meter motion motor netic north pole number of ampere number of lines number of turns OF-A OF-The ohms permeability placed plate pole piece position pounds produced QUESTIONS ON CHAPTER resistance rheostat rotation self-induction short circuited sparking speed square inch storage battery telegraphic term sometimes tion transformer ture unit voltage voltaic voltaic cell volts watts wire wound zinc
Page 365 - British thermal unit is the amount of heat required to raise the temperature of 1 pound of water 1 degree F...
Page 352 - ... electric current is necessarily accompanied by the absorption of electric energy in producing a magnetic field. It is a constant quantity in a circuit at rest, and devoid of iron, depending only upon its geometrical arrangement, and usually expressed in henries, or in centimeters. Magnetic Flux. — The total number of lines of magnetic force in any magnetic field. Ohm. — The practical unit of electrical resistance. Such a resistance as would limit the flow of electricity to a current of one...
Page 316 - Circuit, Short. A shunt or by-path of comparatively small resistance around the poles of an electric source, or around any portion of a circuit, by which so much of the current passes through the new path, as virtually to cut out the part of the circuit around which it is placed, and so prevent it from receiving an appreciable current. Circuit, Shunt. A branch or additional circuit provided at any part of a circuit, through which the current branches or divides, part flowing through the original...
Page 316 - SERIES—A compound circuit in which the separate sources, or the separate electro-receptive devices, or both, are so placed that the current produced in each, or passed through each, passes successively through the entire circuit from the first to the last.
Page 316 - A compound circuit in which a number of separate sources, or separate electro-receptive devices, or both, have all their positive poles connected to a single positive lead, or conductor, and all their negative poles to a single negative lead or conductor.
Page 355 - The unit of force is that force which, acting for one second on a mass of one gramme, gives to it a velocity of one centimetre per second.
Page 413 - 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 383 - It will be shown in a later section that the power dissipated in a resistor is equal to the product of the resistance and the square of the current.