International Library of Technology: A Series of Textbooks for Persons Engaged in the Engineering Professions and Trades, Or for Those who Desire Information Concerning ThemInternational Textbook Company, 1902 |
Άλλες εκδόσεις - Προβολή όλων
International Library of Technology: A Series of Textbooks ..., Τόμος 39,Μέρος 2 Πλήρης προβολή - 1908 |
Συχνά εμφανιζόμενοι όροι και φράσεις
accumulators acid ampere-hours ampere-turns amperes armature back pitch battery brushes C₁ carbon cathode cell centimeter charge chemical action chloride commutator segments connected copper core coulombs current flowing curve Daniell cell deflection depolarizer diameter difference of potential direction drum winding ductor dynamo dyne electricity electrolyte electromotive force elements energy equal example external circuit foot-pounds force per square formula galvanometer given horsepower hydrogen insulation resistance internal resistance iron joint resistance joules length lines of force liquid machine magnetic circuit magnetic density magnetic field magnetizing coils magnetizing force magnetomotive force measured metal moving needle number of coils number of lines Ohm's law ohms output oxide parallel passing pole pole-pieces proportional r₁ resistance of branch sectional area separate resistance short-circuited shown in Fig shunt solution square inch substance sulphate surface tangent tangent galvanometer tion total number two-circuit unit voltmeter volts watts winding spaces wire zinc zinc sulphate
Δημοφιλή αποσπάσματα
Σελίδα 1698 - The calorie is the amount of heat necessary to raise the temperature of one gram of water one degree centigrade.
Σελίδα 1464 - The term electromotive force, usually written EMP, is employed to denote that which moves or tends to move electricity from one place to another.
Σελίδα 1515 - 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 13 - Fig. 1133 illustrates a case of circular motion which differs in many features from the first two considered. Here the lines of force are parallel to each other and at right angles to the axis of rotation ; consequently, the angle between the direction of motion and the direction of the lines of force changes at every instant. From this it follows that the EMF also varies during successive instants. Although the direction of motion of the conductor changes, at any one point it may be considered to...
Σελίδα 1592 - X / acting in the opposite directions on the two poles of the magnet form a couple tending to rotate the magnet about its center o. The moment of this couple is equal to one of the forces multiplied by the perpendicular distance between their lines of action. (See Art. 9O6.) That is, the moment of the couple produced by the force H p is equal to H py.c N, and its direction is right-handed.
Σελίδα 1505 - Art. 1 148, that the heat which is generated by doing 778 foot-pounds of work is exactly equal to the amount of heat required to raise the temperature of 1 pound of pure water 1° F., at or near 39° F., the temperature of its maximum density. This amount of heat is called one British Thermal Unit (written BTU).
Σελίδα 1656 - C', C" are fastened to the board, as shown, and to these are screwed the terminals a and b;c,d, and c; /and g, respectively. From an inspection of the figure, it will be seen that the strip C corresponds to the piece d in Fig. 1005; C corresponds to the middle section e, and C* to the piece c in the same figure. The resistance coils furnished for use with this bridge are of the form illustrated in Fig. 1014. The resistance coil is made up of a coil of German silver wire R, insulated with silk, wound...
Σελίδα 1472 - The unit of energy is also the erg ; for the energy of a body is measured by the work it can do. The unit of energy, the erg, is therefore also one dyne centimeter.
Σελίδα 1447 - From these experiments are derived the following laws: When two dissimilar substances are placed in contact, one of them always assumes the positive and the other the negative condition, although the amount may sometimes be so small as to render its detection very difficult.
Σελίδα 1577 - Art. 1, it is stated that a current will be induced in a closed coil or circuit when there is a change in the number of lines of force passing through that coil or circuit.