EMAGS FINALS 2 Flashcards
Electric Permittivity parallel to
Magnetic Permeability
Electric Charges parallel to
Magnetic Poles
- Positive & Negative
- Can exist separately as purely positive and purely negative charge
Like – Repel, Unlike - Attract
Electric Charges
- North & South
- One found in each magnet’s end. Monopoles does not exists.
Like – Repel, Unlike - Attract
Magnetic Poles
Electric Fields is proportional to
Magnetic Fields
Electric Flux is proportional to
Magnetic Flux
Electric Force is proportional to
Magnetic Force
Refers to the physical means of sending (and receiving) signal information from source to destination.
Transmission Media
It is the most important part of the communications system as it is the component that links the source to the destination.
Transmission Media
Generally, refers to signals that are of EM origins.
Electromagnetic (EM) Signals
These are signals above 20kHz frequency.
Electromagnetic (EM) Signals
These include broadcast and telecommunication signals, infrared, visible light, ultraviolet, x-rays and gamma rays.
Electromagnetic (EM) Signals
The variety and applications of these signals is essential to our modern society for our survival and comfort.
Electromagnetic (EM) Signals
Applications of EM signals today are for _______________; which includes the internet and cellular networks, and in the _____________, which include x-rays, MRI’s, ultrasound and medical procedures using EM waves.
Telecommunications, Medical Field
3 Forms of Transmission Media
- Wired
- Wireless
- Hybrid Form: Wire + Wireless
These media are usually solid linear conductors that physically connect the transmit and received signals.
Wired
_______ media has the limitation of distance but has a better reliability due to the visible physical connection and less susceptive to atmospheric noise being insulated.
Wired
Real world examples of wired media are:
landline wires,
coaxial cables,
ethernet (LAN) cables and
fiber optic cables.
These media have no material boundaries due to being NOT solid.
Wireless
These are designed for short or longer distances as depending on the magnitude of the input power that sustains it.
Wireless
Wireless transmission can be ________ to interference due to being ______ to the elements.
susceptive, open
The convenience of no physical restrictions due to the nature of this media, is its main draw.
Wireless
Wireless real world examples are:
Wifi,
Infrared,
Microwave Radio,
Satellite,
Bluetooth,
Free-to-Air Broadcast (AM/FM/DTV),
In practice, there is going to be a hybrid form of transmission media, wherein some sections are wired and some are wireless.
Hybrid Form: Wire + Wireless
Those that transverse long distances are usually wired and as it approaches the user or receiver side becomes wireless.
Hybrid Form: Wire + Wireless
In some cases, it can also be reversed, in such that at the transmission media was wireless and at the user side it became wired.
Hybrid Form: Wire + Wireless
is a specialized cable or other structure designed to conduct electromagnetic waves in a contained manner.
Transmission Line
The term applies when the conductors are long enough that the wave nature of the transmission must be considered.
Transmission Line
It has a center conductor covered with an insulator, then braided or solid outer conductor, and then insulation.
Coaxial
Transmission Lines two possible models:
- T-Model
- Pi-Model
The equivalent impedances form a “T” shaped circuit between the source and load
T-Model
The equivalent impedances form a “π” or pi shaped circuit between the source and load
Pi-Model
