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GLOSSARY 383
Modulation: The process of impressing an audio-frequency variation, such as that of speech, upon a radio-frequency carrier; the control of carrier energy is in accordance with signal variations.
Ohm: The unit of electrical resistance and impedance.
Ohm's law: The fundamental law of electricity. It states that the current in amperes flowing through a circuit is equal to the pressure in volts divided by resistance in ohms.
Oscillations: Alternating currents of very high frequencies are called electrical oscillations. If the amplitude of a series of oscillations is constant the oscillations give rise to continuous or undamped waves; but if the amplitude is not consistent and is of a decaying nature (as in the spark method of transmission) we obtain damped waves.
Output circuit: The circuit into which a device delivers energy; in an audion, the plate-filament circuit.
Parallel: The side-by-side connection of several electrical
devices, especially of battery cells having all the negative
cell terminals connected together and all the positive cell
terminals likewise connected. Plate: The anode or output electrode of an audion (vacuum
tube). Plug: A connecting device for use in conjunction with a jack
for convenient and rapid alteration of circuits or transfer of
instruments. Potential: The energy of an electrical charge measured by its
power to work or with reference to some standard. Potentiometer: A potential divided; a resistor arranged for
convenient alteration of the electromotive force applied
to a circuit. Primary: The input coil or circuit of a transformer.
Radio frequencies: Frequencies corresponding to vibrations not normally audible to the human ear. All frequencies above 10,000 cycles per second are termed radio frequencies.
Reactance: The portion of impedance due to both inductance