83 pages matching direct current in this book
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adjusted alternating current alternating-current ammeter ampere-hour amplifier tube antenna applied armature audio audio frequency battery bias broadcast capacity cathode cell characteristic charge choke coil conductor connected coupling crystal current flow curve cycles decibel decrease designed detector diagram direct current direct-current direction finder doubler effect electrical electrolyte electrons filament filter frequency grid harmonic Hence increase indicated inductance input load impedance loop machine magnetic field maximum meter method microphone modulation motor negative obtained ohms operation oscillator output peak phase plate circuit plate current plate voltage plate-current pole positive potential power amplifier primary winding produce radiation radio radio direction finder radio-frequency radio-frequency amplifier ratio reactance receiver rectifier relay resistance resistor resonance result rheostat secondary winding shown in Fig shunt signal supply switch tank circuit terminals transformer transmission transmitter tuned unit vacuum tube variations varying voltmeter volts watts wire zero