lesson 1: computer concepts – part 2. inside the system unit part 2 video expansion cards ports
TRANSCRIPT
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Lesson 1: Computer Concepts – Part 2
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Inside the System UnitPart 2
Video Expansion cards Ports
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Computer Video Components
Video monitor Video controller Video driver
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Computer Video The image on the monitor is composed of tiny dots called pixels.
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Resolution
The higher the resolution setting, the more you can display on the monitor - but images appear smaller at higher resolutions.
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Purchasing a Monitor
Features toconsider…• Screen size
• Maximumresolution
• Dot pitch
• Verticalfrequency
• Non-interlacing
Screen size is measured diagonally.
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Examples of Expansion Cards
Modem Sound Video Capture Network/LAN TV Scanner
A video adapter card
An internal modem card
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Types of Expansion Slots
PCI ISA
The system busconnects expansion
slots to themicroprocessor.
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Examples of Ports
A. PS/2B. USB PortC. SerialD. ParallelE. SCSIF. VideoG. Miniplug
sH. JoystickI. Phone
JackJ. RS-14
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Examples of Peripherals
KeyboardMouseMonitorPrinterScannerExternal Modem
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How Modems Work
A modem takes a digital signal and converts it to sound - and vice versa
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Printers
Laser Fast, higher initial cost, less cost per page
Ink Jet Slower, lower initial cost, higher cost per page
Laser printers are often used
for high volume, high quality,
black and white printing.
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Surge Protector
Prevents surges in power from ruining delicate computer circuitry
Always connect yourcomputer andperipherals to asurge protector.
Photo courtesy of
Kensington Technology Group
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Computer Software
Software is the logical component of a computer system.
Most software is distributed via floppy disks and CD ROMs
Do not confuse the containerwith the contents.
Floppy and CD-ROM discs are containers for software, butnot the software itself.
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Computer File
A collection of data with some common purpose.
All computer software is stored in the form of files. Some computer files are programs.
Other computer files may contain work that you have
created, such as a letter or picture.
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Types of Software
DataAppsOS
Software
Programs
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The Operating System
Controls all basic computer functions
Lets you give simple commands to hardware.
Works with application programs to help yousave and retrieve your work
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Examples of the Operating System at Work
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Application Programs
Software that helps you get work done Word Writing w/ Proofing Excel Electronic Spreadsheet Outlook Email Access Electronic Filing Cabinet PowerPoint Graphic Communication
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User Files
These files store work that you have performed with an application program,such as:
A letter A drawing A database of information A game you have stored to continue later
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Computer Viruses
Viruses are small programs that can invisibly “infect” your system without your knowledge. Viruses can cause your computer to halt, or erase files on
the disk drives. Many new viruses are discovered every week.
Computer viruses are malicious programs created by programmers (i.e. people).
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Anti-Virus Software
These programs watch all activity on your system and can detect many viruses as they try to infect the system.
As new viruses are identified, anti-virus software vendors update their software. You can usually obtain these updates over the Web.
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Researching Software
Research software first Before you shop for hardware, you should always
research the software you wish to run on the computer.
Every application program has requirements for the hardware and operating system that it needs to function properly. If your computer does not meet these requirements, the application program will not run.
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Purchasing Hardware After Selecting Your Software
Microprocessor Type (e.g. Pentium III) Speed (e.g. 500 MHz)
Operating System RAM Hard Drive Space Drive Options Other Hardware
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Setting Up a ComputerErgonomics is the science of designing equipment to maximize your productivity and reduce fatigue.
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Healthy Work Habits with Computers
Risks of computer use include: Exposure to radiation Eye strain Repetitive stress injuries
With good work habits, you can significantly reduce or eliminate these risks.
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Lesson 1: Computer Concepts – Part 2