Loading presentation...

Present Remotely

Send the link below via email or IM

Copy

Present to your audience

Start remote presentation

  • Invited audience members will follow you as you navigate and present
  • People invited to a presentation do not need a Prezi account
  • This link expires 10 minutes after you close the presentation
  • A maximum of 30 users can follow your presentation
  • Learn more about this feature in our knowledge base article

Do you really want to delete this prezi?

Neither you, nor the coeditors you shared it with will be able to recover it again.

DeleteCancel

Make your likes visible on Facebook?

Connect your Facebook account to Prezi and let your likes appear on your timeline.
You can change this under Settings & Account at any time.

No, thanks

IGCSE ICT

No description
by

Nikita Natasha

on 13 May 2014

Comments (0)

Please log in to add your comment.

Report abuse

Transcript of IGCSE ICT

Hardware
- Physical components that make up the computer.(Keyboard,Mouse...)
Software
-Programs that control the computer system.(System software,Operating software, Application Software.
CPU-
Central processing Unit. Carries out software instructions.(Microprocessors)
Internal hard drive-
Computes main memory. Where computer software/ disk operating system and data files are stored.

Section 1: Types and components of computer system.
TYPES OF COMPUTER
Out Put Devices
Input Device=
Hardware devices that allow information to be input into a computer.
Output Device=
Hardware device that allow information to be output from a computer.
Section 2: Input and Output Data
IGCSE ICT
By KIKI
MANUAL INPUT DEVICES
Aromatic input Devises
Main components of general-purpose computer:
RAM
- Random Access Memory. Data is temporarily stored, when running applications. Write to and Read from. Its Volatile "Temporarily stored"
ROM- Store Information that needs to be permanent, and can not be altered. Only READ from and not lost when power is turned off.NON-Volatile.Boot File
BIOS-Basic Input/Output System.Stores Date/Time
CMOS.- Complementary Metal Oxide Semi-Conductor=Battery Power
ROM
RAM
OPERATING SYSTEM:
Enables user to communicate with computer system.Controlling,supervision,Dealing with errors ans maintaining computer.
COMMAND LINE INTERFACE
= Typing in command. User in direct contact with computer.

GRAPHICAL USER INTERFACE
= Built around graphical/visual things. Through icons, simple selection, that executes all steps.Use Cursor.
PC/DESKTOP
General purpose computer. Made of spare monitors. IBM compatible.
A
= Parts are cheap
Better specification
Good dissipation of heat.
D= Not portable
Need wiring
Cluster
LAPTOP
All parts in one.
A=low wight
Portable
Low power consumption
NO wires
WiFi
D=Easy to steel
Low battery life
Awkward keyboard/mouse

PDA
Personal Digital Assistant, Small handhold computer.Personal organisers, Data loggers and satellite.
A=Use Anywhere
Light
Portable

D=Difficult to enter text
Limited capabilities.

MAINFRAME COMPUTER
Large, powerful computer system.
Run commercial application( BANKING,INSURANCE) made up of several CPU.Multiple operating system

A=Do large Jobs
Time sharing system
Can deal with complex math

D= Need large room
expensive to buy and maintain/operate
RECENT DEVELOPMENTS IN ICT
Cloud Computing
E-Books
Cloud Computing:
Store documents/programs/Data in the internet.
Save Space on computer
Create,Edit and Share files
Accessible,lower cost,BACKUP,Share
E-BOOKS
Digital version of traditional printed publication

Data Can be entered: Manually-Data entered by hand
Automatically-data entered by machine
Keyboard:Entering Text.
fast entry of text, easy
Limited arm/wrist movement.
Enter Numbers only!
Fast and easy to carry
No letters so no mistake.

small keys difficult.Bad for text
Control the pointer.
faster selection than typing
Easy navigation
Restrict hand/wrist movement
Easy to damage
Hard to use if no flat surface

Tracker ball
Used in application where user has a disability.
can use when no flat surfaces
more difficult to get use to.
Joystick
moving the stick controls the ointer.Less desktop space.
Buttons for selection
Use in 3D dimension
Remote controls
uses infra red
radiatio
n signals.Butto
ns for sel
ecting.
Can operate
from a di
stance
Limited hand
/wrist mo
vement, can work if passa
ge is bloc
ked.
Digital cameras
There is no film, so its
cheaper. Easy

and fast to upload.Images
can be

enhanced and are better
quality.
They are expensive to buy, need computer to.
SCANNERS
scanned by light source produce a digital
image.
edi
t images at later date. faster than typing a
document.
Quality
can be low, and take up disk space
Microphones
Sound input in.ADC used.
Faster to read than type.edit sound.
Uses up memory, not very accurate, leads to errors.
Touch pads

Magnetic Strip Reader
A=fast entry.error free.secure.
D=If damaged, loss of all data. need magnetic card to read. small storage.
CHIP AND PIN READER
Put card in slot.
A=Secure,Need PIN,
Portable
D=Forget PIN-
cant use it.
IMPORTANT::
The (A=) means Advantages
The (D=) means Disadvantages.
Optical Mark Reader
inputting pencil marks and reading them and inputting them into computer.
Bar Code Reader
Inputting code numbers from products through POS terminal...
A=Fast,Central Base database gets updated. Auto-stock control.
D= expensive and not Fool Proof!
TYPES OF PRINTERS:
CRT monitor
A=high quality image, better angle of viewing, cheaper
D=heavy,consume a lot of power, flicker(headache)

TFT monitor
A=lighter,less glare,consume less power,less radiation
D=Unclear image,Poor quality;angle is critical, Cant use with light pens.
MULTI MEDIA PROJECTOR
Receive signals, use remote control, source image is magnified and projected.
A=Many can see presentation/ enhance experience
D=Fuzzy image/expensive/difficult to set up.
SPEAKERS
Connect to computer, monitor DAC, Output Sou!
They are expensive.
LASER PRINTER
A=High quality had copy, Use buffer memory, fast, Used where Noise levels need to be low. Print a lot-fast
D=expensive,only fast for producing loads,produce ozone layer gases
INKJET PRINTER
A=output is high quality, cheaper,lighter,not produce ozone gas
D=slower,Not large prints,Ink smudges,Expensive to run.

DOT MATRIX PRINTER
Slow,noisy, useful for continuous printing.
Used in noisy places. unaffected by dust
Cheap
PLOTTER
produce large, accurate prints(posters)
Highy Quality
Slow,Expensive
Types of Storage devices
Why Back up Data?
hackers delete it
Accidental delete it
data Damages/lost.
Magnetic Storage
(Direct/Serial)
Fixed hard disk(DIRECT)
=Store operating systems,software,working data.Online and real time processes.
A=Fast Read,Huge capacity,Easy to upload/delete files.
D= can be damaged easily
Magnetic Tape(SERIAL)
= Backup file servers,Batch processing.
A=Robust,Less Expensive,Large storage
Optical Storage
Mediums that use light to read/write info. Stored in number of dots.Read by laser beam.
CD/DVD ROM - (Read Only)
CD/DVD R - (Recordable once)
CD/DVD RW -(Record endlessly
DVD RAM -(Writing and Reading at same time
Solid State
smallest form of memory, used as removal storage. Most expensive and roust. Easily written to and read from.

Data Storage
= When we put data into a known place, which e can come back to at a later date.

Backing Storage Media
= Internal or External device that stored data temporarily or permanently.

Baking
= Using storage devices to copy files and data to a different storage medium
SECTION 3:storage devices and Media
SECTION 4: COMPUTER NETWORKS
What is a computer network?
Two or more computers connected together to exchange data, share files, use cables, Store data centrally, communicate, and share resources.
Vulnerable to hackers,network break and viruses
LAN= Local Area Network (within small area)
WAN= Wide Area Network (join several LAN)
WLAN(Wireless Local Area Network
Types of network
Network Devices
Why use internet
mini-multi player games
web pages
e-mail
sharing files
voice and Video

Preventing unauthorized access
Use user name/password
Firewall
Data Encryption
Easy to add new PC
Cheap to install
Does not need hub

If one n, they all go down
Outdated
Star Network
:
easy to identity problems
all stay connected if one breaks
fast

if central down, they all go down.
expensive
Ring Network:
Work well under y load
large

Difficult to add new PC

Hybrid Network
Connection of star network
ROUTER
Connects two or more LAN to make a WLAN
SWITCH:
direct data packets to specific computer
hub:
Broadcast data packets to computer in a LAN
NIC
Enable computers to connect to a network
modem
Modulates data and demodulates phone signals.
WHATS NEEDED TO SET UP SMALL NETWORK?
Hub/Switches
Network Cables
Wireless Access Point
Router
Firewall Protection
Bridge
Server
ISP
SECTION5: Data Types
Logical/Boolean
Alphanumeric/text
Numeric(real/integer)
Date

FILE=
collection of records and field name
RECORD=
set of date in a table/row
KEYFIELD
=unique field in record
FLATFIELD
= all data in 1 table
RELATIONAL DATABASE
= use 2 tables linked together.(benifts are duplicate data is reduced, quicker to update and quicker to enter data.
ANALOGUE DATA
= use values that change very smoothly
DIGITAL DATA
= jumps from one value to another in step by step sequence.
SECTION 6:The effects of using ICT
Software copyright
HACKING= Breaking into a computer system
VIRUS= program that replicated itself and is designed to damage a computer system.
causes: downloading infected files
Bad e-mails
Memory sticks with virus
What happens? cause computer to crash, loss of files,corruption of data.
Computer infected by:
PHISHING: through the use of emails, gather personal and financial info.

PHARMING: Code installed on users hard disk/server, misdirect to fraudulent websites. By email or installing bad software.

SPYWARE: Through network connection

COOKIES: Store info on user on web.
USE ANTI_SPYWARE
Effect of ICT on Employers
fewer are needed
atomatation in factories
increased teleworking
decrease need for labour intensive workers
need for emplyes to be trained frequently.

Loss of Jobs:
Shop workers
Office workers/Bankers
Library work
Online Shopping
Robots replace humans
Manual repetative jobs
Gain of Jobs:
network managing and technician
Web Designer
Programer
Computer engineer
system analysis
SECTION7: The Ways In Which ICT In Used
Communication Application( Newsletter/flyers/magazine)
Digital Communications(websites,cartoon)
Data Handling(data is input and stored before output, survey result)
Measurement Applications
BATCH PROCESSING
: number of similar jobs collected together all processed all at onxe, takes a long time(Bills,Payroll)
ONLINE PRECESSING
: Users communicate directly with computer, and carried out immediately
REAL-TIME PROCESSING
: Use sensors rather than humans.
Application for publicity:
Business Cards
Letter heads
Flyers
brouchurs
Application in Banking:
EFT
ATM
Internet Banking
Telephone Banking
Applications in Retail Industry:
POS
EFTPOS
CHIP/PIN PAYMENT
AUTO-RE ORDERING STOCK
INTERNET SHOPPING
Application in Manufacturing Industries
Robots(controlled through microprocessors, program with sequence of instructions, and do series of tasks.Equiped with sensors.
EXPERT SYSTEM: computer software that acts like a human expert in a particular subject
Made of:
Knowledge base
Ruler Base
Inference Engine
Input Screen
Full transcript