Practical Electricity: With Questions and Answers

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Cleveland armature works, 1911 - Electricity - 471 pages
 

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Page 365 - British thermal unit is the amount of heat required to raise the temperature of 1 pound of water 1 degree F...
Page 425 - Thus, the reduction of the value of the modulus between the melting point of ice and the boiling point of water is...
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.
Page 358 - The galvanometer depends for its operation upon the fact that a conductor, through which an electric current is flowing, will deflect a magnetic needle placed near it. This deflection is due to the magnetic field caused by the current.

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