Network Cable Theory 1&2 Flashcards
Subatomic particles found in atoms that balance out the positive charge of a proton (within the nucleus) with their negative charge.
Electrons
Substance that allows heat or electricity to pass along or through it, for example, cables, wires, metal surfaces, and water.
Conductor
A battery or generator that provides electrical power to the circuit. For example, batteries and generators.
Power source
A conductor, such as the copper wire.
Path
The device that uses the electricity. It is any device that draws current
Load
The copper-clad aluminum center of the coaxial cable is this
conductor
the electromotive force that causes electrons to flow in a circuit.
Voltage (E)
Components of a Circuit; E represents this:
Voltage
Components of a Circuit; I represents this:
Current
Components of a Circuit; R or Ω (Omega) represents this:
Resistance
measured in volts and is designated mathematically as E
Voltage
The pressure that causes electrons to flow in a circuit.
Electromotive force
the flow of electrons through a conductor
Current
measured in Amperes
Current
The amount of electrons that pass a given point in the conductor in one second.
Coulomb
One coulomb passing through a given point in one second is equivalent to this
One Amp
the opposition a material offers to the flow of current
Resistance
used to control the amount of amperage in a circuit
Resistance
measured in Ohms
Resistance
states that current is directly proportional to voltage and inversely proportional to resistance.
Ohm’s law
What is the formula for Ohm’s Law
R=E/I or resistance equals voltage divided by current
Ohm’s Law calculation; E=
E= I x R
Ohm’s Law calculation; I=
I= E/R
Ohm’s Law calculation; R=
R= E/I
the effect of voltage causing the movement of current for a certain length of time
Power
Formula for Power
P = I x E
Formula for Power; P represents this:
Power in Watts
Formula for Power; I represents this:
Current in Amperes
Formula for Power; E represents this:
EMF in Volts
In a cable network what component is a Load
Nodes and Amplifiers
In a cable network what component is a Power Source
Power Supply
In a cable network what component is a Conductor
Coax cable and Taps
the exponent or the power to which a fixed number (the base) must be raised in order to produce a given number
Logarithm
used for shortening mathematical calculations
Logarithm
The exponent of 10 required to equal the number
Logarithm
the number of times the base is multiplied by itself.
Exponent
he number being raised
Base
Any number raised to the exponent 0 is equal to
1
Any number raised to the exponent 1 is equal to
Itself
Prefixes; Giga
G 10^9
Prefixes; Mega
M 10^6
Prefixes; Kilo
k 10^3
Prefixes; Milli
m 10^-3
Prefixes; Micro
µ 10^-6
Prefixes; Pico
n 10^-12
Prefixes; Nano
p 10^-9
by definition, one tenth of a bel
decibel
he unit for expressing, in logarithmic terms, the ratio between two power levels
bel
10 log(P1/P2)
dB
Early television signal levels were measured with a field strength meter calibrated in this
microvolts
20 log (E (mV) / 1)
dBmV
20 log (E1 (mV)/ E2 (mV))
dBmV
Resistance is measured between the center conductor and sheath with the other end shorted when measuring for this:
DC Loop Resistance
The difference in voltage between one point and another.
Potential Difference
The direction of an electrical field in a radiated wave.
Polarity
DC
Direct Current
AC
Alternating Current
An electrical current, of which the polarity is periodically reversed.
Alternating Current (AC)
Types of AC Waveforms
Sine, Square, Quasi-square, Sawtooth wave
This waveform represents the characteristics of the voltage/current that feeds your home, powers your power supplies, and the television channels that carry the program information to your customers’ homes.
Sine Wave
This waveform is often found within the switching regulator DC output power supplies in amplifiers.
Square Wave
A CATV power supply without a load produces a near square wave that combines a non-linear increase and decrease of voltage or current with an extended maximum positive and negative peak value.
Quasi-square Wave
This waveform is typically used to drive the horizontal trace on an oscilloscope or spectrum analyzer.
Sawtooth Wave
The square root of the arithmetic mean of the squares of a set of values.
Root Mean Square (RMS)
a graphical representation of the relationship between two signal attributes
waveform
defined as one complete sine wave.
cycle
CPS
cycles per second
defined as the number of cycles of an AC waveform that occur in one second
Frequency
can be defined as the physical length of one cycle of the voltage waveform
Wavelength
the amount of time it takes an AC waveform to complete one cycle.
Period (T)
the peak value of an AC waveform
Amplitude
the position of the amplitude value as related to time
Phase
concept is used in every large cable system that uses amplifiers.
Unity Gain
The human ear can hear AC waveforms over what range?
16-16,000 Hz
Channel 2’s analog visual carrier operates at an AC frequency of what?
55.25 MHz
the point at which the filament in a light bulb reaches a temperature that causes it to glow is called what?
Incandescence
On the graph of an AC waveform, what is displayed on the vertical axis?
Voltage or Current
On the graph of an AC waveform, what is displayed on the horizontal axis?
Time
The section of a waveform above the horizontal axis generally corresponds to what?
Positive Polarity
The section of a waveform below the horizontal axis generally corresponds to what?
Negative Polarity
This german physicist was the first to produce radio waves artifically
Heinrich Rudolph Hertz
