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alternating current amperes Angstroms anode applied atoms bactericidal basic become bimetal broadcasting called capacitance carbon cathode cathode-ray tube Chapter characteristics circuit coil color color temperature condenser conductor current flow device direction discharge discussion electric current electromagnetic radiation electromagnetic waves electron flow electron tubes element emission emitted filament fluorescent lamps FREQUENCY MODULATED glass grid heat iconoscope incandescent lamps inductance infra-red radiation ionized length light sources lines of force longer wavelengths loop low-pressure lumens per watt magnetic field mercury mercury-vapor metal meters method molecules motor operation oscillations pass photo-electric tube plate positive power factor pressure produced quartz radiant energy radio waves radium rays reflected refraction region resistance resonance result shorter wavelengths solid sound waves speed starter supersonic surface television temperature thermionic emission tion transmission transmitting types ultra violet ultra violet radiation unit vapor vibrate visible light voltage volts wavelengths wavelengths and frequencies wire X-rays