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What is a Computer?

1. Define what a computer is
A computer is a device that can be programmed to complete tasks,       communications and store data.

2. Diagrams - MS Excel to create & PowerPoint to convert to jpeg/png
a. Computer Model 1
b. Computer Model 2

Why do we use Computers? 
1. Storing large amounts of Data- Can be used for people in banks for  transaction data
2. Rapid processing of Data to produce Information - Used in video games
3. Communication- Banks use it for email,skype etc.

Computer Model 1
Computer Model 2

1. Babbage- analogue- Victorian mechanical computers.
The Babbage Engine. Charles Babbage (1791-1871), computer pioneer, designed the first automatic computing engines. He invented computers but failed to build them. The first complete Babbage Engine was completed in London in 2002, 153 years after it was designed.
2. WW2 Bombe & Colossus- To break to Enigma code
Colossuss was a set of computers developed by British codebreakers during 1943-1945. it performed counting operations and it was the worlds first prgrammable, electronic and digital computer.
3. Post war LEO - early electronic
LEO Computers Ltd merged with the computer interests of English Electric in 1963 to form English Electric LEO, and later, English Electric Leo Marconi (EELM). Subsequent mergers eventually found LEO incorporated into ICL in 1968, whilst the Bureau operation, based at Hartree House, combined with Barclays to form Baric.
LEO II computers were installed in many British offices, including Ford Motor Company, British Oxygen Company and the 'clerical factory' of the Ministry of Pensions & National Insurance at Newcastle. LEO lll computers were installed in Customs & Excise, Inland Revenue, The Post Office and in Australia, South Africa and Czechoslovakia.
4. 1980s - PCs- Birth of modern computers
New computer products and services introduced in 1981. IBM introduced its first personal computer called the IBM PC in 1981.The computer was code named and still sometimes referred to as the Acorn.
In the early part of the 1980s, the dominant microprocessors used in home computers were the 8-bit MOS Technology 6502.
5. Modern - some examples- Laptops, gamming, home computers
Personal Computer (PC) is a multi-purpose computer whose size, capabilities, and price make it feasible for individual use. PCs are intended to be operated directly by an end user, rather than by a computer expert or technician. Computer time-sharing models that were typically used with larger, more expensive minicomputer and mainframe systems, to enable them be used by many people at the same time, are not used with PCs.


1. Inputs
2. Outputs
3. Storage Media
4. Computer Parts
5. Software