Intro To Computer Hardware

7,332 views
6,668 views

Published on

Published in: Technology
0 Comments
6 Likes
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total views
7,332
On SlideShare
0
From Embeds
0
Number of Embeds
171
Actions
Shares
0
Downloads
545
Comments
0
Likes
6
Embeds 0
No embeds

No notes for slide

Intro To Computer Hardware

  1. 1. Intro to Computer Hardware Mr Arthur
  2. 2. Aims of the Lesson 1 1. To discuss computer hardware and software 2. To examine the difference types of Input and Output devices 3. Quickly finish folder labels and print 4. Research different input and output devices
  3. 3. Computer Systems  Hardware  All the Physical parts of a Computer System (the bits that you can see and touch)  Software  Software is a collection of programs that help the computer hardware to work properly
  4. 4. The Computer System Input Devices Processor Backing Main Memory Storage CPU Devices RAM and ROM Output Devices
  5. 5. Aims of the Lesson 2 1. To discuss the different input devices we looked at last period 2. To discuss the different output devices 3. To identify the characteristics of different output devices
  6. 6. Input Devices The Physical Parts of a Computer System which allows data to be entered into a Computer System  Keyboard  Graphics Tablet  Touch-Sensitive Screen  Mouse  Microphone  Digital Camera  Digital Video Camera  Webcam  Trackball  Trackpad  Joystick  Scanner
  7. 7. Output Devices  An output device is a device which allows data to be displayed or passed out of a computer system  Printers  Laser  Inkjet  Monitor  Liquid Crystal Display  Thin Film Transistor  Cathode Ray Tube  Plotter  Load speaker  Projector
  8. 8. Laser Printer  A laser printer uses a laser beam to project the image of a page on to a photosensitive drum. It then attracts toner by means of an electrostatic charge before transferring it to paper.
  9. 9. Inkjet Printer  Inkjet printers produce printouts by firing tiny drops of ink at the paper. Each drop makes up part of the letter or picture.  They produce good quality printouts and can print onto plastic and CDs.  Most modern inkjet printers hold 2 ink cartridges, one with black ink and one with colour
  10. 10. Comparison of Printers  Printers are usually compared in relation to 3 different factors  Resolution  A Printers accuracy is known as its resolution. Resolution is measured in dots per inch  Speed  The speed of a printer is measured in pages per minute (PPM)  Cost  Capital cost is how much it costs to buy the printer  The Running cost is how much it costs to use the printer
  11. 11. Comparison of Printers Type of Speed Cost Noise Quality Printer Dot-matrix Slow Cheap Noisy Poor Ink jet Medium Mid Quiet Good Laser Fast Expensive Very Quiet Very Good
  12. 12. Aims of the Lesson 3 1. To revise the different Output devices 2. To revise characteristics of printers 3. To introduce backing storage devices 4. To discuss different storage capacities
  13. 13. Backing Storage  We require backing Backing Storage Media storage to store Magnetic Tape programs and files Floppy Disk Hard Disk  Without backing storage CD-ROM all our data would be DVD-ROM lost when we turn the CD-Rewriteable computer off CD-Recordable DVD-Rewriteable DVD-Recordable USB Flash Pen
  14. 14. Storage Capacities 1 bit = on or off 8 bits = 1 byte 1024 bytes = 1 kilobyte 1024 kilobytes = 1 megabyte 1024 megabytes = 1 gigabyte 1gb 1.3 mb
  15. 15. Aims of the Lesson 4 Last Lesson • To revise characteristics of printers • To revise backing storage devices Today’s Lesson • Begin the Word Processing Unit
  16. 16. Aims of the Lesson 5 Last Hardware Lessons • To revise input devices • To revise output devices • To revise characteristics of printers • To revise backing storage devices Today’s Lesson • To discuss the processor • Parts of the Processor
  17. 17. The Computer System Input Devices Processor Backing Main Memory Storage Central Devices Processing Unit RAM and ROM Output Devices
  18. 18. The Processor  The processor or Central Processing Unit is the brain of the computer  The performance of the processor is measured in Giga Hertz (GHz)  We send programs to the processor to get the computer to do something
  19. 19. Aims of the Lesson 6 Last Hardware Lessons • To revise input devices • To revise output devices • To revise characteristics of printers • To revise backing storage devices • Processor • Parts of processor Today’s Lesson • Main Memory • RAM / ROM
  20. 20. RAM and ROM  Main Memory  Types of Main Memory  The Main Memory of a  Random Access computer is used to Memory store programs and  Where programs is data stored temporarily while  The processor cannot the computer is on store the whole  The contents of RAM is program and needs its lost when the computer is switched off main memory to store parts of the program  Read Only Memory  Where data and programs are stored permanently

×