Electronics (Mike Jaroch)
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The time required to complete one cycle of a waveform   .
A waveform that undergoes a pattern of changes, returns to its original pattern, and then repeats the same pattern of changes. Examples are square waves, rectangular waves, and sawtooth waves .
PERMANENT MAGNET SPEAKER
A speaker with a permanent magnet mounted on soft iron pole pieces .
The measure of the ability of a material to act as a path for magnetic lines of force  .
The length of time a phosphor dot glows on a CRT before disappearing  .
A variable-length sawtooth generator often used to produce a sweep on an A-scope .
The number of electrical degrees of lead or lag between the voltage and current waveforms in an ac circuit  .
(pm)—Angle modulation in which the phase of the carrier is controlled by the
modulating waveform. The amplitude of the modulating wave determines the amount of phase shift, and the frequency of the modulation determines how often the phase shifts .
A device used to change the phase relationship between two ac signals .