GCSE ICT/GCP Revision Guide

Section One- What is A Computer?Edit

DataEdit

Data has NO MEANING

  • Data is information that has no meaning.
  • Data only becomes information when you know the context of the data.
  • Information = Data + Meaning

Data is stored in Bytes

  • Computers use a binary code (i.e. they use only 2 digits) to represent data. Usually, a circuit that's switched on represents the digit 1, and a circuit that's switched off represents the digit 0.
  • Bit: Each individual 1 or 0 is called a bit - short for binary digit.
  • Byte: 8 bits is called a byte.
  • Kilobyte: 1 kilobyte (1 KB, or simply 1 K) is about a thousand bytes. to be exact, 1KB = 2 to the power of 10 = 1024 bytes.
  • Megabyte: 1 megabyte (1MB) is about a million bytes. To be exact, 1 KB = 2 to the power of 20 = 1048576 bytes.

Computer SystemEdit

Data is entered at the input stage

  • information is converted into data before its entered into the computer

The computer then processes the data

  • Processing involves turning the input data into something else

The results are then sown at the output stage

  • Output is when the computer communicates the results of the data processing to the user.
  • The two most common ways are a screen display and printed paper.
  • At this point the data becomes information again
  • The information obtained at the output stage might then be used as feedback to input more data. this turns the system into a cycle.

Computerised v. Manual SystemsEdit

Types of ComputerEdit

Networks - LANs and WANsEdit

Networks - Different ConfigurationsEdit

Network SecurityEdit

Revison SummaryEdit

Section Two- The Parts of A computer SystemEdit

9-Input DevicesEdit

An input device is any hardware which is used to enter data into the computer system. The input devices of a computer are

  • QWERTY Keyboard
  • Mouse
  • Camera
  • CD
  • Microphone
  • Scanner
  • Disk Drive
  • Joystick

12-The CPUEdit

CPU stands for Central Processing Unit

  • The CPU is the portion of a computer system that carries out the instructions of a computer programs

Section Three- Using a A computer SystemEdit

Section Four- System AnalysisEdit

Section Five- Text and Image Processing SoftwareEdit

Section Six- Spreadsheets and DatabaseEdit

The BasicsEdit

Spreadsheets are clever calculatorsEdit

  • A spreadsheet is a program that can display and process data in a structured way.
  • Spreadsheets can process numbers and also handle text.
  • spreadsheets can be used to:record data, search for particular items of data, perform calculations based on data, produce graphs and charts.

Data is entered into cellsEdit

  • Spreadsheets are formed by tables- rows and columns divide them selves in to cells.
  • Each cell can be recognized by using coordinates by using the row number and column letter.

Each cells can contain one of three thingsEdit

Cells can only contain one thing of these three things

  • Numerical Data- for example numbers, money and dates
  • Text Data
  • Formulas

Creating and improvingEdit

Simple FormulasEdit

The Trickier stuffEdit

Graphs and ChartsEdit

Section Seven- Measurement, Control and simulationEdit

Section Eight- The InternetEdit

Internet BasicEdit

  • The Internet is an International Network of computers

To connect you need Special Hardware and Software:

  • Most people access the internet using a PC conneted to a telephone cable or cable TV services these two items can not work without a modem. A modem converts data from the computer into a format suitable for sending over the telephone or other communication line. Both ends of the connection need a modem.
  • The Internet Has Two Main Parts:

1) The World Wide Web (WWW) is the part that contains web pages. 2) Electronic Mail(E-MAIL) is the part where messages are sent from one person to another - it works a bit like sending a letter.

E-mailEdit

  • There is 5 step to sending an E-mail

Step 1-Create the message Step 2-Connect to the Internet Step 3-Press the send button Step 4-The message is sent from the sender's ISP to a mailbox in the computer system of the recipient's ISP Step 5-The recipient later connects to the internet, opens their e-mail account, and finds the new message

  • Emails has Benfits and Problems

Emails take quick to send It is cheaper than posting or faxing The same message can easily be sent to loads of diffent people Both need Internet access and Email accounts

Using the World Wide Web-NavigatingEdit

  • The Internet is a huge Source of Information

You can access the Internet form any computer, the Information is up to date.

  • Type in the URL

URL stands for Uniform Resource Locator URLS's can not cantain capital letters or spaces or certain types of punctuation

Navigating and DownloadingEdit

Web Page DesignEdit

Using the Internet-Data SecurityEdit

User-Generated ContentEdit

Social NetworkingEdit

Online Audio and VedioEdit

Online SoftwareEdit

Revision SummaryEdit

Section Nine- Computers in the real worldEdit

Computers in ShopsEdit

Computers in BanksEdit

Section Ten- Computers and SocietyEdit

Parvin+Eisha

Computers And The LawEdit

Computer are used to store and process important data. As it is easy to transfer data through the internet. So there are laws to protect the use of computers

The Copyright, Design and Patents Act Controls Illegal copyEdit

This law was introduced in 1989, this law made it so that it was illegal to copy a file without permission from the owner, or copyright user.

Three ways that this law is broken up into:

  • Using software without a proper licence. E.g. if you acquire a MS software disk and upload it onto one computer station, it is illegal to use it on any other computer station.
  • Downloading text or images without saying where you have gotten it from, or with receiving the copyright owner's permission.
  • Copying a computer program that you use at another place and running at a computer at home without the permission from the copyright holder.

The computer misuse act prevents illegal Access to filesEdit

This law was introduced in 1990 to stop hackers and viruses. The act made the following three things illegal:

  • Unauthorised access to computer material. E.g. hacking
  • Attainment of unauthorised access to a computer to carry out serious offence such as fraud and blackmail.
  • Unauthorised changing of computer files. E.g. planting viruses and deleting files

Computers and the workplaceEdit

Computer Use-Health And Safety IssuesEdit

computer use can cause three main problemsEdit

three main solutionsEdit

emloyers need to follow the lawEdit

Social, Moral And Ethicaal IssuesEdit

main issues are Social, Moral And EthicaalEdit

four main moral and ethnical issuesEdit

unrestricted internet accessEdit

ease of copying computer filesEdit

computers and replacing people at workEdit

increased goverment sureilanceEdit

five main social issuesEdit

information rich and information poorEdit

the internet's changing how we interactEdit

over-reliance on technolagyEdit

impact on literacyEdit

faster pace of lifeEdit

Last modified on 11 November 2013, at 22:59