Electric current (waves) that continually changes in
amplitude and reverses polarity.
Basic unit of electrical current flow.
A wave of constant amplitude, frequency and phase
which can be modulated by changing amplitude,
Electric current (waves) of a constant amplitude
Flow of charge or rate of such flow.
Electric current (waves) that flows in only one
DIRECT CURRENT (dc)
direction and remains essentially constant in mag-
Transmission and reception over teletypewriter
lines are possible at the same time.
A device to open a circuit when excess current
exists in a circuit.
Equal length pulses making up a code with spacing
In a normal condition; neither positive (+) nor
Generates repetitive waveforms at a fixed or varying
Provides dc voltage to operate tubes. Power
POWER SUPPLY CIRCUIT
higher ac voltage and then is tube rectified
to dc. Also provides low voltage of 12.6 and 6.3
vac for tube filaments.
A quick change in voltage, either positive or
negative which conveys information to a circuit.
To receive a signal or message.
An outlet to which the male end of a power cord is
Changes ac voltage to dc.
Equal length pulses making up a code with marking