Practical Electricity

alternating current alternating e.m.f. alternating-current circuit amp.-turns ampere-turns amperes angle armature assumed atoms battery brush cell coil commutator conductor connected copper counter e.m.f. current flows decreases degrees developed diagram direct current direct-current direction e.m.f. impressed e.m.f. induced e.m.f. of self-induction effective elec electric circuit electrical energy electrolyte electromagnetic electrons Example.—If Example.—What external circuit flux density formula graph helix Hence Hydraulic Analogy impressed e.m.f. inch increases induced e.m.f. inductors instant insulating internal resistance lamps leakage length Lenz's law line wires lines of force lines per sq load loop loss machine magnetic circuit magnetic field metal molecules motor negative number of lines number of turns Ohm's law ohms permeance permittance plate pole positive power-factor practically pressure primary produce reactance rheostat rotated secondary self-induction shown in Fig shunt sine Solution.—Substitute speed temperature three-phase tion torque transformer varies vector voltage volts watts winding zero zinc