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a-c voltage ammeter amperes amplitude antenna armature audio amplifier audio signal battery bias voltage buffer buffer amplifier called capacitance capacitor carrier cathode cell charge Class A amplifier conductor connected control grid coupling crystal oscillator detector diagram diode electrical energy electrons field coil filament filter formula happens harmonic heat hertz impedance increase inductance input signal kilohertz lead-acid magnetic field magnetic lines maximum means measure megahertz meter microphone modulation motor move negative ohms operation output parallel peak pentode plate voltage polarity positive power amplifier power supply primary produce push-pull quency Questions Q r-f amplifier ratio reactance receiver rectifier resistance resistor screen grid secondary shunt sidebands sine wave station tance terminal Test Q tetrode trans transformer transistor transmission line transmitter triode tuned circuit turns vacuum tube voltage and current voltage drop voltmeter volts watts wavelength winding wire zero