Introduction to computers 1. Objectives Define a computer Identify types of computers Discuss the advantages and disadvantages of computer usage.

Introduction to computers

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Objectives Define a computer Identify types of computers Discuss the advantages and disadvantages of

computer usage.

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What is a Computer? An electronic device that can:

Accept data and instructions Process them (sort, perform calculations etc.) Store the result And produce output

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Types of Computers Mainframe Minicomputer Microcomputer (PC)

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Mainframe Big, powerful Used by large

organisations Universities Banks Utility Companies

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Minicomputer Smaller than mainframe and less powerful Much bigger than average PC Obsolete

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Microcomputer Contains a microprocessor Much smaller than other types Better known as the PC Main form factors (in decreasing size):

Desktop Laptop/Notebook Palmtop

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Desktop PC

monitor

tower (Contains CPU)

mouse

keyboard

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Laptop PC Also called a

Notebook PC Hardware combined

into a single unit

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Palmtop PC Handheld PC Uses stylus or

touchscreen Smartphones fall into

this category

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stylus

Advantages of Computers Fast and accurate Efficient data storage and retrieval

Thousands of books can fit on a USB drive Do not get bored or tired

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Disadvantages Downtime caused by power outages Health risks

Carpal tunnel syndrome Eyestrain Neck and shoulder pain

Job losses

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