AC Waveforms Flashcards
One familiar source of a direct current (DC) signal is a what
Battery
DC
Direct Current
Batteries use a chemical to produce a what
DC Voltage
Typical batteries provide electromotive force in this range
1.5 volts to 24 volts
These batteries provide 1.5 volts
Standard AA, triple-A, and D-cell flashlight batteries
These batteries provide 12 volts
Automotive batteries
The two terminals on a battery are
Positive and Negative
The battery provides this to cause current flow in a circuit
Electromotive force or voltage
In a DC circuit, the current always flows directly from here to there
the positive terminal of the voltage source to the negative terminal of the voltage source
current flowing through the resistor dissipates power as this
Heat
What can be used to determine the relationship between the voltage, resistance, and current.
Ohm’s Law
What can be used to determine the relationship between voltage, current, and power.
Joule’s Law
The DC voltage is what as a function of time
constant
A plot of a signal as a function of time is called
time-domain representation
AC
Alternating Current
The voltage provided by a power outlet reverses polarity how often
60 times a second or 60 Hz
The signals carried over a hybrid fiber-coax network are
AC Signals
The particular shape of the AC voltage used for power in a household outlet is a
sinusoidal or sine wave
In the case of a sinusoidal voltage such as household AC power, the RMS voltage is what times the peak voltage or 115 volts.
0.707
the powering voltage waveform used in hybrid fiber/coax networks.
quasi-square-wave
Typical HFC powering voltages are
60 volts AC peak or 90 volts AC peak
In an AC circuit what direction does the current flow?
In both directions
You must use this of an AC circuit to get the equivalent DC voltage.
RMS (Root Mean Square) voltage
Ohm’s Law
I=E/R or E=IxR or R=E/I
Joule’s Law
P=IxE
can be used in AC circuits so long as the voltage and current are RMS values.
Joule’s Law
can be used in AC circuits just as it is used in DC circuits.
Ohm’s Law
displays AC voltages as a function of time.
The oscilloscope
to plot the sum of the two sine waves as a function of frequency
frequency domain
designed to display signals in the frequency domain.
Spectrum analyzers
