computer operation
TRANSCRIPT
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User must know
1. Know the 3 basic operations of a computer
2. Identify the different parts of a computer
3. Connect the different parts of a desktop computer
4. Distinguish between hardware and software
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2.1 The Basic Operations of a Computer
• A program consists of step-by-step instructions telling the computer what to do and how to do it
• Without instructions, computers cannot do anything
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2.1 The Basic Operations of a Computer
• People need instructions to do something too
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2.1 The Basic Operations of a Computer• Do people and computers carry out a
task in similar ways?• Compare how people and computers
divide 2,760 by 4
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2.1 The Basic Operations of a Computer
• Both people and computers do the following:
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2.1 The Basic Operations of a Computer
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2.2 Parts of a Computer• A computer is made up of different
parts• Each part performs different function or
operation
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2.2 Parts of a Computer
• The casing of the system unit• Commonly called
Central Processing Unit (“CPU”)
• Contains a processor
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2.2 Parts of a Computer• The casing of the system unit (Cont’d)
• Comes in a variety of design
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2.2 Parts of a Computer• The keyboard and mouse
• Important tools because they are used to control the computer
• Designs have improved greatly
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2.2 Parts of a Computer• The display unit
• Displays information onto a screen• Main way computer communicates with
users• Many types invented over the years
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2.2 Parts of a Computer• Printers
• Prints text or illustrations onto paper• Main types:
• Thermal printer• Print created by
pushing heated pins against heat sensitive paper
• Cheap and fast• Used widely in
supermarket checkouts and ATM
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2.2 Parts of a Computer• Printers (Cont’d)
• Inkjet printer• Print created by
spraying dots of ink onto paper
• High quality text and graphics
• Slow• Cost of printer low
but cost of ink is high
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2.2 Parts of a Computer• Printers (Cont’d)
• Laser printer• Print created by
• Applying ink powder (toner) to drum
• Toner on drum is then heated and applied to paper
• Very high quality text and graphics
• Fast• Expensive• Toner is sold in cartridges
• Expensive but can print more pages than an inkjet printer
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2.2 Parts of a Computer• Printers (Cont’d)
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2.3 Software and Hardware
1.Inkjet2.Laser3.Dot matrix4.Laser
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2.2 Parts of a Computer• Printers (Cont’d)• Multifunctional printers
• Multiple functions• Printing, copying
and faxing• Convenient• Disadvantages
• Over-using one function may interfere with other functions
• More likely to break down due to the many functions
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2.2 Parts of a Computer• Wired and wireless computer parts
• Computer parts classified into wired and wireless ones
• Wired computer parts• Physically connected by wires or cables• Connected to attachments called ports
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2.2 Parts of a Computer• Wired and wireless computer parts
• Wireless computer parts• No physical
connection• Example: wireless
router, cordless mouse
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2.3 Software and Hardware• Computers need hardware and software to work• Hardware
• Physical• Can see and touch
• Software• Data and instructions for the hardware to operate
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2.3 Software and Hardware
1. Hard disk, keyboard, LCD monitor, mouse, printer2. (Any 5 examples)– Operating system: Microsoft Windows, Linux, Mac
OS etc.– Application program: Adobe Photoshop, Microsoft
Word, Warcraft, Internet Explorer, Macromedia Dreamweaver
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2.4 Input, Output and Storage Devices
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2.4 Input, Output and Storage Devices
• All these are input devices
• Scanner• Scans
information on hard copy into the computer
• Microphone• Captures sound
into the computer
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2.4 Input, Output and Storage Devices
• CPU• Contains the central processor
• “Brain” of the computer• Processes data and
instructions• Hard disk
• Stores data• Hard drive
• Helps store and retrieve data
• Floppy disk drive• Reads and writes data on
floppy disks• CD-ROM drive
• Reads data from CD-ROMs
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2.4 Input, Output and Storage Devices
• CPU (Cont’d)• Thumb drive
• Also called USB flash drive• Reads and writes data onto
the drive’s memory chips• Main memory
• Stores data and programs to be used by the main processor
• Includes• Read Only Memory
(“ROM”)• Stores data
permanently• Random Access Memory
(“RAM”)• Stores data
temporarily
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2.4 Input, Output and Storage Devices
• All these are output devices• Monitor
• Like a television screen• Displays information from the
data inputted• Printers
• Display information on paper• Hard copy
• Some prints in colour; others print in black only
• Speakers• Produces sound and music
generated by the computer
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1. Keyboard, mouse, flat-bed scanner, microphone
2. Monitor, speaker, laser printer, inkjet printer (Other answers: projector)
3. CD-ROM drive, hard disk (Other answers: thumb drive)
2.4 Input, Output and Storage Devices