class 5 chapter 1

Computer Notes (Class 5)

1. What is a Computer?

A computer is an electronic machine that accepts data as input, processes it, and gives output as information.

Definition:
A computer is an electronic device that takes input, processes the data, stores it, and produces useful output.

Example:

  • Desktop Computer
  • Laptop
  • Tablet
  • Smartphone

2. Evolution of Computer

Evolution of computer means the development and improvement of computers from early machines to modern computers.

Earlier, computers were very large, slow, and expensive. With time, technology improved and computers became smaller, faster, and more powerful.

Early Calculating Devices

DeviceYearInventorUse
AbacusAround 3000 BCChineseUsed for counting and basic calculations
Napier's Bones1617John NapierUsed for multiplication and division
Pascaline1642Blaise PascalUsed for addition and subtraction
Stepped Reckoner1673Gottfried Wilhelm LeibnizUsed for addition, subtraction, multiplication, and division
Difference Engine1822Charles BabbageUsed to calculate mathematical tables automatically
Analytical Engine1837Charles BabbageFirst mechanical computer with memory and processor concept
Tabulating Machine1890Herman HollerithUsed punched cards to process census data
Differential Analyzer1931Vannevar BushUsed to solve complex mathematical equations
Turing Machine1936Alan TuringTheoretical machine that introduced the concept of modern computers
Mark I (Harvard Mark I)1944Howard Aiken (with IBM)First large-scale automatic electromechanical computer

3. Generations of Computer

Computers developed in five generations based on the technology used.

First Generation Computer (1940 – 1956)

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Technology Used: Vacuum Tubes

Features:

  • Very large in size
  • Produced a lot of heat
  • Consumed more electricity
  • Very expensive

Processor Used: Basic Machine Language Processor

Example:

  • ENIAC
  • UNIVAC

Second Generation Computer (1956 – 1963)

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Technology Used: Transistors

Features:

  • Smaller than first generation
  • Faster processing
  • Produced less heat
  • More reliable

Processor Used: Assembly Language Processor

Example:

  • IBM 1401
  • IBM 7090

Third Generation Computer (1964 – 1971)

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Technology Used: Integrated Circuits (IC)

Features:

  • Much smaller size
  • Faster speed
  • More reliable
  • Less power consumption

Processor Used: High level language processors

Example:

  • IBM System 360
  • PDP-8

Fourth Generation Computer (1971 – Present)

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Technology Used: Microprocessor

Features:

  • Very small size
  • Very fast speed
  • Personal computers developed
  • Less expensive

Processor Used: Microprocessor (Intel series)

Example:

  • Desktop Computer
  • Laptop
  • Apple Macintosh

Fifth Generation Computer (Present and Future)

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Technology Used: Artificial Intelligence (AI)

Features:

  • Very intelligent systems
  • Voice recognition
  • Machine learning
  • Robotics

Processor Used: Advanced AI processors

Example:

  • AI Robots
  • Supercomputers
  • Smart devices

✅ Conclusion:
Computers have evolved from large vacuum tube machines to powerful AI-based systems, making our work faster and easier.

If you want, I can also give a 1-page short exam note for Class 5 students (very easy to memorize) or a table format for quick revision.

  

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