International Library of Technology: A Series of Textbooks for Persons Engaged in the Engineering Professions and Trades, Or for Those who Desire Information Concerning Them, Τόμος 11International Textbook Company, 1906 |
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Άλλες εκδόσεις - Προβολή όλων
International Library of Technology: A Series of Textbooks ..., Τόμος 11,Μέρος 2 Πλήρης προβολή - 1905 |
International Library of Technology: A Series of Textbooks for ..., Τόμος 11 Δεν υπάρχει διαθέσιμη προεπισκόπηση - 1902 |
International Library of Technology: A Series of Textbooks for ..., Τόμος 86 International Textbook Company Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2015 |
Συχνά εμφανιζόμενοι όροι και φράσεις
ampere-hours ampere-turns amperes amperes flows annealed atoms battery bichromate branches British thermal unit C. G. S. unit calories capacity carbon cathode centi charge chemical chloride circular mils coil compound condenser conductor connected copper wire coulombs current flowing depolarizer diameter dielectric difference of potential direction dynamo elec electric current electrodes electrolyte electromagnetic electromotive force element energy equal equivalent EXAMPLE flux foot-pounds force per square formula given grams heat hence hydrogen increases induction insulating internal resistance iron joint resistance joules junctions Leclanché cell length lines of force liquid magnetic circuit magnetic density magnetic field magnetic substance magnetizing force magnetomotive force metal mils molecules number of lines Ohm's law ohms oxide oxygen parallel permeability plate pole porous cup produced r₁ sectional area shown in Fig solenoid solution specific resistance square centimeter square inch sulphate sulphuric acid temperature total number total resistance voltaic cell volts watt-hours watts zinc
Δημοφιλή αποσπάσματα
Σελίδα 37 - The strength of a continuous current of electricity in a circuit is directly proportional to the electromotive force, and inversely proportional to the resistance of the circuit, and is equal to the quotient arising from dividing the electromotive force by the resistance.
Σελίδα 56 - Six cells, each having an emf of 2 volts and an internal resistance of 0.3 ohms, form a series battery to send a current through a resistance of 50 ohms.
Σελίδα 12 - The gram calorie, or small calorie (cal.), is the amount of heat required to raise the temperature of 1 gram of water 1°...
Σελίδα 28 - If the north pole of one magnet is brought near the south pole of another magnet, attraction takes place; but if two north poles or two south poles are brought together, they repel each other. In general, like magnetic poles repel one another ; unlike poles attract one another.
Σελίδα 5 - It is customary to express the energy values of different food materials in terms of calories ; a food calorie is the amount of heat required to raise the temperature of 1 kilogram of water 1° C. The physiological fuel values of the main food groups are as follows :— Carbohydrates . . . .4-1 calories per gramme.
Σελίδα 24 - When all the cells joined together in series are similar in kind, size, and condition, as is usually the case, the total internal resistance is equal to the resistance of one cell multiplied by the number of cells.
Σελίδα 2 - ... proportional (1) to the resistance of the conductor; (2) to the square of the current; (3) to the time during which the current flows.
Σελίδα 77 - Mayer- in the same year. The subject was taken up by Hermann '' about 1890, and he obtained valuable tracings by using the wax-cylinder phonograph. He succeeded in obtaining photographs of the curves on the wax cylinder, a beam of light reflected from...
Σελίδα 39 - As we have now learned the use of Ohm's law, it may be well to give some additional information regarding the relation of the units to one another. 74. Referring to formula 14, we have volts — amperes X ohms. It follows from this that a volt would be that electromotive force, or difference of potential, that would force a current of 1 ampere through a resistance of 1 ohm. A CGS unit of difference of potential (or of electromotive force) would be that difference of potential (or electromotive force)...
Σελίδα 33 - ... has to be attended to, ia to see that the annual cost of the energy wasted in a mile of the feeder, added to the annual allowance (per mile) for depreciation and interest on first cost, shall be a minimum. With regard to the question of varying current, the energy lost in a given cable depends upon the square of the current and the time during which the current is flowing. If a cable conveys a current, C, only 12 hours out of the 24 hours, then the energy wasted per day is only half what it would...