Topic 4 Electrical Impulses 1 identify communication technologies that transform one type of energy into electrical energy 2 describe the transmission of images using digital technologies in ID: 673664
Download Presentation The PPT/PDF document "SENIOR SCIENCE INFORMATION SYSTEMS" is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
Slide1
SENIOR SCIENCEINFORMATION SYSTEMS
Topic 4: Electrical ImpulsesSlide2
1identify communication technologies that transform one type ofenergy into electrical
energy
2
describe the transmission of images using digital technologies in
terms of scanning of the input image along very thin lines
3
explain how the coding of the image into a series of zeros and ones
allows its transmission and ultimate decodingSlide3
Coding and Decoding InformationCoding converts information into binary coded form which uses
the digits
0 and 1. The digital transmission is by electrical, light
or electromagnetic
impulses representing the 0s and 1s. Decoding
changes the
0s and 1s impulses received back to information which can
be understood
by the receiver.Slide4
Coding and Decoding InformationSlide5
Faxes
Faxes information is optically
scanned
along very thin
lines
across the
page.
A
page is broken up into a
grid
consisting of very small
boxes
.
The
scanner records the number
one
in the box when scanning a
dark section
and a
zero
when scanning a white section.
This
light energy information is transformed by a photodiode
into
electrical
energy
and sent along phone lines.
The
receiving
fax
machine puts
ink
in the small grid boxes with
ones and
leaves the boxes with zeros
blank
.Slide6
Energy Transformation ReviewSlide7
Energy Transformation ReviewSlide8
Generating Electrical Impulses
When
you use batteries in your camera,
walkman
or remote control
car, you
are changing chemical energy from the batteries into
electrical energy.
When you use a microphone, sound energy is converted into an
electrical signal.
When an aerial receives radio waves, it converts these waves into an electrical signal.
The
kinetic energy of the steam turns turbines
which turn
generators to produce electricity, thus turning kinetic energy
into electrical
energy.Slide9
Generating Electrical Impulses
Mobile phones and telephones change what form of energy into
an electrical
signal
?
Televisions
and radios change what form of energy into
electrical signal?
Fax
machines and long distance telephone lines (optical fibres)
convert what
form of energy into electrical energy
?Slide10
Generating Electrical Impulses
Mobile phones and telephones change sound energy into
electrical energy.
Televisions
and radios change electromagnetic energy into
electrical
energy.
Fax
machines and long distance telephone lines (optical
fibres) convert
light energy into electrical energy.Slide11
ReviewSpotlightSummarise
pg
204-207
Answer “To Think About” Questions