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Com
puter Literacy B
AS
ICS
WHAT MAKES A COMPUTER A COMPUTER?
A computer is an electronic device that Receives data: Information, such as text,
numbers, or graphic images, is entered into the computer.
Processes data: The computer will change the data from what was entered into the result the user wants.
Stores data: The information is stored in the computer’s memory.
Produces a result: A final display of the information that was entered can be printed or displayed on a monitor.
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puter Literacy B
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WHY ARE COMPUTERS SO POPULAR?
Computers perform functions very quickly. Computers produce accurate and reliable
results. Computers store large amounts of data. Computers are versatile and cost-effective. Computers are becoming more powerful and
more useful every day.
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puter Literacy B
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HOW COMPUTERS ARE USED TODAY
Computers are used every day for News: Newspapers and television news
stations post breaking news, and weather can be accessed on demand on the Internet.
Shopping: Millions of people use the Internet every day to purchase goods and services.
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puter Literacy B
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HOW COMPUTERS ARE USED TODAY (CONT.)
Homework: Students have instant access to research and information and use word-processing and other software applications for assignments.
Managing businesses: Businesses use computers to maintain inventory records, print invoices, track financial information and personnel records, advertise online, and many other tasks.
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puter Literacy B
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TYPES OF COMPUTERS
Supercomputers: The largest and fastest computers that are used by government agencies and large corporations to process tremendous volumes of data. Video
Mainframes: Large, very expensive machines that can support thousands of users; used by large corporations.
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puter Literacy B
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TYPES OF COMPUTERS
Minicomputers: Larger than a desktop and much more expensive, but can support many users
Microcomputers: Commonly called personal computers or desktop computers. Personal computers also includeDesktop computersNotebook (laptop) computers“Smart Phones”, iPad, & iPod
Touch
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puter Literacy B
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OTHER COMPUTING DEVICES
Microprocessors are computer chips that perform special functions to process information.
These computer chips help many kinds of equipment perform more efficiently and effectively: Household appliances Calculators, cellular telephones, and digital
cameras Game systems Automobiles Industrial equipment
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puter Literacy B
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COMPUTER SYSTEMS
A computer system is a combination of parts working together: Hardware: The physical devices such as
keyboard, monitor, CPU, and so on Software: Operating systems and application
programs Data: The information entered into a
computer to be processed People: The users who enter the data and use
the resulting output
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puter Literacy B
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COMPUTER NETWORKS
A network consists of multiple computers connected to each other to share data and resources.
Local Area Network (LAN): A computer network located in a small area, such as one building or department.
Wide Area Network (WAN): A network made up of several LAN’s in a city, region, or across the world.
Networks at in schools, businesses, and people’s homes.
Computer Literacy BASICS14
THE MOTHERBOARD
The motherboard is a circuit board inside the computer’s plastic case. It contains integral components including
The central processing unit or CPU RAM & ROM Expansion ports and slots
Computer Literacy BASICS16
THE CENTRAL PROCESSING UNIT
The CPU is a tiny chip that acts as the brains of a computer.
Also called the processor. Intel & AMD are the 2 biggest makers of processors
The rate of speed is measured in gigahertz (GHz).
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TYPES OF COMPUTER MEMORY
There are two types of memory found on a motherboard:
RAM: Random Access Memory
ROM: Read-Only Memory RAM
chip
Computer Literacy BASICS18
RANDOM ACCESS MEMORY (RAM)
RAM is short-term, temporary memory where data is processed while a program is running.
The more programs you have running, the more RAM you are using.
This type of memory loses any data it holds if the computer is shut down.
Computer Literacy BASICS19
READ-ONLY MEMORY (ROM)
ROM is permanent memory placed on the motherboard by the manufacturer and contains instructions, such as BIOS ROM, that tell the computer how to start itself.
This data cannot be accessed or modified by application programs.
The contents of this memory are not lost when the computer is shut down.
HOW INFORMATION IS STORED
Data is stored in a computer in binary format as a series of 1s and 0s. Every 1 or 0 is a bit of information.
Data is stored in a series of 8-bit combinations called a byte.
8 bits (01101101) = 1 byte
Computer Literacy BASICS21
HARD DRIVE Hard disks are large-capacity and fast-access
storage devices. Most data on a computer is stored here. Hard disks are usually built into the
computer’s case. Early computers had a storage capacity of
about 20MB, but now hard drives of 60GB or more are common.
Computer Literacy BASICS24
INPUT AND OUTPUT DEVICES
Input devices: enable a user to input data and commands to the computer to be processed.
Output devices: enable the computer to give or show you the results of its processing.
Some devices, such as a modem, can perform both input and output operations.
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EXAMPLES OF INPUT DEVICES
Keyboard Mouse Voice recognition devices Scanners Joysticks
Cell phone Touch display screen Digital cameras Video camera
Computer Literacy BASICS26
ONE OUTPUT DEVICE — PRINTERS The most popular types of printers are
Laser: Produce images using the same techniques as copier machines
Ink-Jet: Use fine nozzles to spray ink onto the page as the paper passes through
Dot matrix: Work similarly to a typewriter in that ink is transferred to the paper by some part of the printer striking a ribbon to transfer an image.
Computer Literacy BASICS28
STORAGE DEVICES A place to save and store files Examples:
Hard drive (can’t take with you)Flash driveFloppy diskCDiPod
USB (UNIVERSAL SERIAL BUS)
Most popular type of plug on computers
Used for printer, keyboard, mouse, scanner, iPod, flash drives and many more
VIRUSA program created to cause harm to other computers
Viruses can be used to ruin a computer or steal personal information
How can you get a virus?
HACKERSomeone that breaks into
computer networks or steals personal information
Could be someone that creates a virus
FIREWALLA program to prevent hackers from stealing information from your computer
Sometimes it needs to be disabled to install new programs
Computer Literacy BASICS34
TYPES OF SOFTWAREThere are literally thousands of software
programs you can buy, but all of them can be grouped into one of two categories:
Applications software Systems software
Computer Literacy BASICS35
APPLICATIONS SOFTWARE
Application software consists of programs that were created to perform a specific task.
Application software is also called productivity software.
Computer Literacy BASICS36
APPLICATIONS SOFTWARE (CONT.)
The most common types of application software areWord-processing programsSpreadsheet softwarePresentation softwareDatabase softwareWeb browsersGames
Computer Literacy BASICS37
SYSTEMS SOFTWARE
Systems software refers to the programs that are used to manage computer system resources.
Systems software coordinates and controls the resources and operations of the computer itself.
The three categories of systems software areOperating systemsUtility programsLanguage translators