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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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