Naval Electricians' Text Book |
Other editions - View all
Common terms and phrases
alternating current ammeter amperes armature battery bearings brake bus bars cable candle-power carbon cell circuit breaker circular mils closed coil commutator conductor connected consists controller copper core counter E. M. F. current flowing curve cylinder diameter difference of potential direction distribution boards double-pole electrical electromagnet engine equal external circuit fall of potential feeder fitted frame fuses galvanometer heat hoisting inch increase induction induction coil insulation internal resistance joules lamp lead length light lines of force load machine magnetic field maximum measured metal motor moving number of lines Ohm's law ohms operation panel parallel plate plug pole pieces position pressure produced rheostat ring screws secured shaft shown in Fig shunt speed spring station steam switch switchboard telephone temperature terminals tion total E. M. F. transmitter turns turret unit valve vibrations voltage voltmeter volts water-tight watts wave wire
Popular passages
Page 32 - Ampere, which is one-tenth of the unit of current of the CGS system of electromagnetic units and which is represented sufficiently well for practical use by the unvarying current which, when passed through a solution of nitrate of silver in water, in accordance with a certain specification, deposits silver at the rate of 0.001118 of a gramme per second.
Page 33 - Henry, which is the induction in a circuit when the electromotive force induced in this circuit is one international volt while the inducing current varies at the rate of one Ampere per second.
Page 32 - As a unit of resistance, the international ohm, which is based upon the ohm equal to 10" units of resistance of the CGS system of electromagnetic units, and is represented by the resistance offered to an unvarying electric current by a column of mercury at the temperature of melting ice, 14.4521 grams in mass, of a constant cross-sectional area and of the length of 106.3 centimetres.
Page 32 - As a unit of electromotive force, the international volt, which is the electromotive force that, steadily applied to a conductor whose resistance is one international ohm, will produce a current of one international ampere, and which is represented sufficiently well for practical use by ^2.
Page 32 - As a unit of quantity, the international coulomb, which is the quantity of electricity transferred by a current of one international ampere in one second. As a unit of capacity, the international farad, which is the capacity of a condenser charged to a potential of one international volt by one international coulomb of electricity.
Page 16 - The calorie is the amount of heat necessary to raise the temperature of one gram of water one degree centigrade.
Page 477 - P = mean effective pressure in pounds per square inch; L = length of stroke in feet; A =area of piston in square inches; N = number of strokes per minute = revolutions per minute x 2.
Page 33 - As a unit of work, the joule, which is equal to 107 units of work in the CGS system, and which is represented sufficiently well for practical use by the energy expended in one second by an international ampere in an international ohm.
Page 442 - Thompson defines a dynamo-electric machine as " a machine for converting energy in the form of mechanical power into energy in the form of electric currents, or vice versa, by the operation of setting conductors to rotate in a magnetic field, or by varying a magnetic field in the presence of conductors.
Page 239 - Between adjacent electric circuits, where such exist, as in transformers. The tests should be made with a sine wave of EMF, or where this is not available, at a voltage giving the same striking distance between needle points in air as a sine wave of the specified EMF, except where expressly specified otherwise.