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Alexanderson alternator alternating current alternating-current ammeter ampere angle angular velocity antenna circuit armature atom audible audio-frequency capacity carriers charging current circuit of Fig coil component condenser conducting conductor conjugate vectors connected considered convenient cosh coupling crystal detector current flowing cycle damped sinusoid decrement detector determined diaphragm direct current direct-current discharge disturbance e.m.f. required electrical energy expression filament grid hence high frequency impedance impressed e.m.f. increase inductance induction coil input instant ionization magnetic field maximum value method motion natural frequency natural oscillations negative obtained ohms operation output path plate circuit point distant Poulsen arc produce quency radians rate of change ratio represent resistance resonance curve rotary gap rotating vector rotor sending end shown in Fig shunt sine sinusoidal sinusoidal current Solution spark gap Substituting telegraphy telephone receiver tion transient current transmission transmitting vacuum tube varies voltage wave length wave meter wire wireless zero
Page 27 - ... the coil is grasped in the right hand in such a way that the fingers point in the direction in which the current is flowing in the wires, the thumb will point in the direction of the north pole of the helix (see Fig.
Page 91 - Excitation, Impulse: A method of producing free alternating currents in an excited circuit in which the duration of the exciting current is short compared with the duration of the excited current.
Page 130 - The combined resistance of several resistances in parallel may be found by taking the reciprocal of the sum of the reciprocals of the individual resistances of the branch circuit.
Page 53 - ... by the movements of a spot of light reflected from a mirror attached to the needle.
Page 2 - Franklin who recognizing these two kinds of electrification introduced the terms "positive" and "negative." Franklin arbitrarily decided to call any body positively electrified if it is repelled by a glass rod which has been rubbed with silk; and...
Page 114 - ... are at right angles to each other and also at right angles to the direction of travel.
Page ii - Coal Age •* Electric Railway Journal Electrical Uforld v Engineering News-Record American Machinist •*• The Contractor...
Page 180 - A shaft runs at 80 revolutions per minute: what is its angular velocity in radians per second...