Network Powering 16 Flashcards
The direction of an electrical field in a radiated wave
Polarity
Four types of AC waveforms
Sine wave, Square wave, Quasi-square wave, and Sawtooth wave
(RMS)
Root Mean Square
What is the relationship between two signal attributes that are represented graphically
Waveform
One complete sine wave
A Cycle
The number of cycles of an AC waveform that occur in one second
One Hertz
Cycles per second
Frequency
The physical length of one cycle of the voltage waveform
Wavelength
The peak value of an AC waveform
Amplitude
The position of the amplitude value as related to time
Phase
Resistance equals voltage divided by current
Ohm’s Law
The amount of energy available to move a certain number of electrons from one point to another in an electrical circuit
Voltage
Batteries should be inspected every ___to ___ months to ensure optimum performance
3 to 6
Transformer that takes 120VAC to 60 or 90VAC
Step down, Ferroresonant transformer
Center conductor resistance + Sheath resistance=
DC Loop resistance
Batteries also produce _____________ gas during charging operations. This gas may vent in an overcharging situation
Hydrogen
When removing batteries, always switch the module’s TURN ___________________off before disconnecting the battery connector.
Battery breaker
Measured in Ohms, the opposition a material offers to the flow of current, used to control the amount of amperage in a circuit.
Resistance (R)
Which way do electrons flow in a circuit?
From negative to positive
Wavelength formula
Wavelength = Speed of Light / Frequency
The electricity provided by the local power company.
Commercial Power
Differences between any batteries in the set should not be greater than
0.3 VDC
Commercial power sends voltage at ____ and _____
240VAC and 120VAC
I=E/R
Amperage=Voltage/Ohms
