What people are saying - Write a review
We haven't found any reviews in the usual places.
Other editions - View all
allow amount amperes armature arrangement bars battery bearings brushes called carbon carrying cause cell circuit closed coil commutator conductor connected consists constant controller core cover curve cylinder difference difference of potential direction effect electrical engine equal external fall field fitted flowing force frame fuses give given heat inch increase indicated induction insulation lamp lead length light lines load losses lower machine magnetic magnetic field means measured metal motor moving necessary ohms operation panel parallel pass pieces plate pole position potential pressure produced receiver represents resistance result rheostat ring screws secured separate shaft shown shown in Fig shows shunt side speed spring starting station steam switch taken temperature terminals turns turret unit valve varying voltage voltmeter volts watts wave winding wire
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 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 479 - 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 444 - 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.