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Output Devices: Sends Processed Data out of the computer. Monitors Printers Output devices make:

2- Output Devices. Output Devices: Sends Processed Data out of the computer. Monitors Printers Output devices make: Soft copies (video, sounds, control signals) Hard copies (print). CRT (Cathode-Ray Tube ): Less expensive Uses much more space Uses more energy

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Output Devices: Sends Processed Data out of the computer. Monitors Printers Output devices make:

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  1. 2- Output Devices Output Devices: Sends Processed Data out of the computer. • Monitors • Printers • Output devices make: • Soft copies (video, sounds, control signals) • Hard copies (print)

  2. CRT (Cathode-Ray Tube): Less expensive Uses much more space Uses more energy Offers better viewing angles Legacy technology LCD (Liquid Crystal Display) More expensive Uses far less space More energy efficient Less viewable from an angle Monitor Types

  3. Printers

  4. Nonimpact Printers 1- Inkjet • Less expensive device • Print high-quality color images cost effectively • Popular 2- Laser • More expensive device • Faster printing speed • Less expensive per page in B&W • Color lasers are becoming less expensive

  5. Wireless Printers

  6. Choosing a Printer 1. Speed (ppm): pages it can print per minute (ppm). 2. Resolution (dpi): measured in dots per inch (dpi). 3. Color output 4. Memory 5. Use and cost 6. Cost of consumables

  7. Specialty printer 3. All-in-one peripherals • Scanner, copier, printer and fax • Inkjet or Laser printer 4. Photo printers: - print digital images. 5. Plotters • Large printers. • Print oversize images, maps and architectural plans. 6. Thermal printer : • Color generated by melting wax or by burning dots onto specially coated paper Plotters

  8. Other Video Output • Touch-screen monitors • Double as both input and output devices • Projectors • Project a computer image to a large screen for sharing with large groups

  9. Outputting Sound • Speakers and headphones

  10. Inside the System Unit • A system unit is a box that contains the central electronic • Essential electronic components used to process data

  11. The Motherboard The Motherboard: is the main circuit board that contains the essential processing parts. Components of the motherboard: 1. CPU 2. Memory 3. Expansion cards and slots

  12. The Motherboard

  13. 1. Central Processing Unit (CPU) • Referred to as the “brain” of the computer • Controls all functions of the computer • Processes all commands and instructions • Can perform billions of tasks per second • Processor Speed is measured in units of Hertz (Hz) “machine cycles per second”

  14. Memory Random Access Memory (RAM) • Stores instructions and data • Temporary (volatile) storage. • Consists of several memory cards or modules Read-Only Memory (ROM) • Stores start-up instructions • Permanent storage

  15. Expansion Cards • Add functions • Provide new connections for peripheral devices • Common types: • Sound Card • Video Card (VGA) • Modem Card => Internet Connection • Network Interface Card (NIC) => to connect with other computers.

  16. 2- Power Controls 1- Power-on button: Turns onsystem, should not be usedto turn it off 2- Sleep Mode: All the documents, applications, and data you were using are stored in RAM, to quickly access it when restarting your computer. 3- Hibernation: Stores your data in memory and saves it to your computer's hard disk.

  17. 3- Storage DevicesDrive Bays • Drive Bay: special location reserved for storage devices. 1- Internal drive bays: • Cannot be access from outside the system • Are reserved for internal hard drives 2- External drive bays: • Can be accessed from outside the system • CD or DVD drives • Floppy and zip drives

  18. Storage Media Capabilities

  19. Connecting Peripherals to the Computer • Ports: - places on the system unit where peripheral devices attach to the computer. - data can be exchanged between devices and the operating system. • Types of ports: • Serial: • Sends 1 bit of Data at a time -> Modems • Parallel: • Sends groups of data bits between devices -> Printers • Universal Serial Bus (USB): • High Speed of Data transfer.

  20. FireWire: • Speedy Data Transfer -> Hard Disk, Digital Camera...etc. • Connectivity: • Gives Access to Network & Internet. • Ethernet: • Provide Speed Up to 1000 MBPS • Modem: • Uses Traditional Phone Line - Multimedia: • Video Graphics Array (AVG) • Digital Video Interface (DVI) • Super Video (S-Video) • High Definition Multimedia Interface (HDMI)

  21. Computer Ports S-Video

  22. Setting It All Up: Ergonomics • Ergonomics: - minimizing injury or discomfort while using the computer • Steps to follow: • Position monitor correctly • Use adjustable chair • Assume proper position while typing • Take breaks • Ensure adequate lighting

  23. Using proper equipment that is adjusted correctly helps prevent repetitive strain injuries while working at a computer.

  24. Chapter Summary • What exactly is a computer, and what are its four main functions? • What is the difference between data and information? • What are bits and bytes, and how are they measured? • What devices do I use to get data into the computer? • What devices do I use to get information out of the computer? • What’s on the motherboard? • Where are information and programs stored? • How are devices connected to the computer? • How do I set up my computer to avoid strain and injury?

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