PowerPoint Presentation How Does a Cell Phone Work by wuxiangyu

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									How Does a Cell Phone Work?
            By Jaki
               Introduction
• Welcome to my slide show! If you are like
  many other Americans in the twenty-first
  century you most likely use a type of
  sophisticated radio, commonly known as a
  “cell phone.” But have you ever really
  wondered how a cell phone works? How you
  can have a simple conversation with
  someone? How you can be directed from one
  call to another? Well if you read into this
  website it will surely explain these question. I
  hope you enjoy! =]
                      science
• Mainly started for business people. Estimated that at least
  One member from each family owns a cell phone in the
  United States. Cell phones are defined as a sophisticated
  radio, or a wireless communication tool that uses, cells,
  base station, and a cell phone tower for each call. There are
  many amounts of cells that use extensive frequencies that
  allow many people to use cell phones at the same time.
  During a call it’s traveled from base station to base stations
  it goes from cell to cell. Cell phones also use a short wave
  analog or a digital telecommunication where a subscriber
  has a wireless connection from mobile telephone to
  relatively nearby transmitter and a receiver in the base
  station.
            … and more science

•        The main part of a cell phone is the “cell”
    which is a system inside the phone. The
    system divides an area of cells into groups of
    cells on a hexagonal grid form. The cell
    phone connects to towers, then connects you
    to land based telephone system route call.
      ….And Some More Science
• When you turn a phone on the first thing it does is
  it listens for certain frequencies (control channel)
  that the phone and tower use to connect. But if
  there is no control channel in that area it says “no
  service.” The second thing that the phone does is
  transmits a registration request, for the MTSO to
  keep track of your location on your phone. It does
  this because it needs to know what cell phone your
  are so it will ring when someone calls you. The
  third thing it does is the MTSO looks for you in its
  database.
....And more science
   The fourth is the MTSO chooses a
frequency pair for your phone to use in
the cell to take the call. The fifth is the
MTSO connects and communicates with
your phone telling it what frequencies to
use and when the phone and tower will
begin these frequencies, and then you
are connected. The sixth and final as
you start to use up all of the cell the
tower takes note of the dying cell, this
means its time for the control channel to
place you with another cell.
              Radio waves

• Radio waves can vary in different sizes. They
  range from football fields to footballs. Its job is
  to carry signals for your cell phone. For cell
  phones mainly they are used to transmit
  information. They vary form being a lot
  smaller than normal television waves.
  Whenever you make a call on your cell phone
  your voice is encoded and made into radio
  waves that are transmitted by the antennae
  on your cell phone and it goes to the nearest
  base station.
Photos
                        Vocabulary
Cell- is a system inside the phone it divides an area of cells into groups of cells
on a hexago nal grid format.

Tower- cell phone towers are solitary struc tures. They transmit radio waves
and must be placed above ground .

Frequencies- These can allow thousands of mobile users to share channels.

MTSO- each carrier in each city runs what is called a central office. known
as the Mobile Telephone Switching Office

Dying cell- Is when its time for the control channel to place you with another
cell.
Radio waves- transmit information by the intennae and goes to a base
station
                                                Graph
                                       How Does a Cell Phone Work?


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Number of Responces




                      5

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                                                                                        2
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                      0
                          Don’t know     incorrect               portonally correct   correct
                                                     Adult responces
The previous graph contains the information
  that I collected from my question.
I asked twenty adults if they knew how a cell
  phone works.
The results were on the previous slide.
                              Related links
    How cell phones work                  Physics of Cell Phones
This site gave me through and          This site gave me step-
clear information about my             by-step information, on
topic.
                                       how a cell phone works.
       How stuff works                           NASA
This site gave me the
                                     This Website gave me clear
“codes” behind the science
                                     information on how radio waves
of a cell phone.
                                     are used by cell phones



        MRS. Peck’s Website                  Biggie Questions

								
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