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What does a computer do?
Accepts data through inputting
Processes data
Stores data
Outputs data
Input Devices
• Mouse
• Keyboard
• Scanner
• Microphone
• Digital Camera
• Voice Command
• Touch Screen
Output Devices
Printer
Monitor
Speaker
Computers STORE Data in Bytes
One byte is 8 bits (a bit is an off/on switch or a zero or a one) a: 01000100
One byte holds one character, numeral, or symbol such as the letter z, the numeral 3, or the symbol *
Kilobyte 1 KB is 1 thousand bytes Megabyte 1 MB is 1 million bytes Gigabyte 1 GB is 1 billion bytes
Storage Devices
Permanent Storage Devices• Floppy Disk 1.4 MB Removable
• Zip Drive 100/250 MB Removable
• USB Storage Device 126 MB - 1 GB+ Removable
• CD-R 700 MB Removable
• DVD-R 4.7 GB Removable
• Hard Drive 60 GB ++ Not removable
Temporary Storage (stores data while processing)
• Random Access Memory - RAM
Saving your data at CCSF
Save on your zip drive or USB storage device. Use Save As the first time you are saving so
that you can indicate WHERE you will store your file/data.
Save often Remember, when you turn off your computer,
everything in RAM is removed. Back-up important files
Computers PROCESS data fast and accurately!
• Central Processing Unit (CPU)
(so called “brain” of the computer• Speed of computer is measured
in Megahertz (MHz)
• 1 Megahertz is a million cycles per second (ours are 450 MHz)
• Computers today often run at 3+ GHz Gigahertz (billion cycles per second)
Software/Programs – Instructions for the Computer
Operating System Software• Performs housekeeping tasks, saves and organizes
files, connects all the peripherals
• Microsoft Windows XP (used by CCSF Business Department)
Applications Software/Programs• Performs specific tasks
• Microsoft Office 2003 is an integrated software package containing various individual programs that do different tasks – Word, Excel, Access, PowerPoint.
Three Major Programs in Microsoft Office 2003
Category Program File Ext.
Common Output
Word Processing Word .doc Letters, reports
Spreadsheets Excel .xlsBudgets, financial
projections
Database Access .mdbClient lists, inventory
Word Processing - WORD
Spreadsheets – EXCEL
Databases - ACCESS
Title Bar Displays Office Program and current file
Menu Bar Contains menu titles for pull down menus with a variety of commands
Standard Toolbar
Contains buttons (icons) you can use to perform common tasks
Formatting Toolbar
Contains buttons (icons) for changing formats including fonts, alignment
Status Bar Tells you status of what is shown on screen such as page # or line #
Task Bar Shows Start Button, Quick Launch Toolbar, and all open programs/files
Task Pane Contains commonly used commands that pertain to each application
Bars and Panes in Windows
Using Control and Shift Keys in selecting files/folders and data
Control Key
• Press as you select each one
• Selects non-contiguous (non-adjacent) files, folders, or data that are in random order
Shift Key
• Press after you select the first one and keep holding until you select the last one
• Selects files/folders and data that are next to each other (contiguous or adjacent)
Using Move and Copy
• When you move a file, folder or data, it is no longer in its original location
• When you copy a file, folder, or data, it is both in its original location and in its new location.
The Ergonomics of Using Computers
Maintain good posture
Stand up and stretch often
Rest your eyesand mind
Take risks, relax and have fun!