Lesson 2 Ppt V6

Hardwares of Personal Computers 1

Hardware of Personal Computers

Topic 4


Part 1: Introduction


What are Basic Hardware of a Personal Computer?

1. Monitor 2. Motherboard 3. CPU (Microprocessor) 4. Primary storage (RAM) 5. Expansion cards 6. Power supply 7. Optical disc drive 8. Secondary storage

(Hard disk) 9. Keyboard 10. Mouse

Figure 1. Basic hardware of a PC. (Wikipedia, 2007a)


What is a Hardware?

• Hardware is the general term that is used to describe physical artifacts of a technology.


Classification of Hardware

Input Devices

1

Processing Unit

2

Storage Devices

3

Output Devices

4

Figure 2. Classification of Hardware.

Key: Data flow


Part 2: Input Devices


What is an Input Device?

• A hardware mechanism that transforms information in the external world for consumption by a computer. (Wikipedia 2007b)


Input Devices

Keyboard for the input of text and characters and also to control the operation of a computer (Wikipedia 2007c)

Mouse a pointing device by detecting two-dimensional motion relative to its supporting surface. (Wikipedia 2007d)

Scanner a device that analyzes images, printed text, or handwriting, or an object and converts it to a digital image (Wikipedia 2007e)


Input Devices

Microphone an acoustic to electric transducer or sensor that converts sound into an electrical signal. (Wikipedia, 2007f)

WebCam a real-time camera (usually, though not always, a video camera) whose images can be accessed using the World Wide Web (Wikipedia, 2007g)

Digital Camera

an electronic device used to capture and store photographs electronically in a digital format (Wikipedia, 2007h)


Part 3: Processing Unit


What is a Processing Unit?

• A central processing unit (CPU), is the component in a digital computer that interprets computer program instructions and processes data. (Wikipedia, 2007i)

• There are 2 major CPU manufacturers for personal computers.

Intel http://www.intel.com/

AMDhttp://www.amd.com

Figure 3. Intel Celern 2.66GHz CPU (Front)

Figure 4. Intel Celern 2.66GHz CPU (Back)

http://www.intel.com/



http://www.amd.com/


How fast is a CPU?

• When you choose a CPU, you should consider its speed.

• The speed of a CPU is determined by 2 main factors.– Clock frequency– Amount of cache

memory• The higher the value, the

faster the CPU will be.

The clock frequency of The clock frequency of a CPUa CPU

Figure 5. The clock frequency of a CPU.


What are Intel CPU Families for Desktop Computers?

There are 3 Intel CPU families for desktop computers:

1.Core Processorhttp://www.intel.com/products/desktop/processors/index.htm

2.Pentium Processorhttp://www.intel.com/products/desktop/processors/pentium.htm

3.Celeronhttp://www.intel.com/products/desktop/processors/celeron.htm

http://www.intel.com/products/desktop/processors/index.htm

http://www.intel.com/products/desktop/processors/pentium.htm

http://www.intel.com/products/desktop/processors/celeron.htm


What are AMD CPU Families for Desktop Computers?

There are 3 AMD CPU Families for Desktop Computers:

1.Athlon 64 FXhttp://www.amd.com/us-en/Processors/ProductInformation/0,,30_118_9485_9488,00.html

2.Athlon 64 x 2 Dual – Corehttp://www.amd.com/us-en/Processors/ProductInformation/0,,30_118_9485_13041,00.html

3.Athlon 64http://www.amd.com/us-en/Processors/ProductInformation/0,,30_118_9485_9487,00.html

http://www.amd.com/us-en/Processors/ProductInformation/0,,30_118_9485_9488,00.html







TASK 1 (Individual work)

• You have learnt some searching skills for search engines, now you need to search the basic configurations and prices of the following CPUs.

• Please complete TABLE 1 and post it in the forum.


TASK 1 (TABLE 1)

Intel CPU AMD CPU

CPU Model Core 2 Due E6700

Celeron D356

Athlon 64 FX – 51/940

Athlon 64 ADA 3200-CN

Clock Frequency (GHz)

Cache Memory L2 (MB)

Price (HK$)


TASK 2 (Group Work)

• You are divided into groups of 4.

• Discuss the above CPU models, which are suitable for home PC or office PC used.

• Give brief reasons.

• Please post your group discussion results in the forum.


What is a motherboard?

• A motherboard is the central circuit board making up a personal computer. (Wikipedia, 2007j)

Figure 6. A motherboard.CPU

RAM slot


Motherboard

• A personal computer is built with the CPU, main memory, and other essential components on the motherboard.

• Other components such as external storage, controllers for video display and sound, and peripheral devices are typically attached to the motherboard via edge connectors and cables.

• In modern computers it is increasingly common to integrate these "peripherals" into the motherboard.


What is a Video Card?

A video card is to generate and output images to a display. (Wikipedia, 2007k)

Figure 7. A video card.


A Video Card

• If the video card is integrated in the motherboard, it will use the computer RAM memory (lower throughput). If it is not integrated, the video card will have its own video memory which is called Video RAM or VRAM.

• The VRAM capacity of most modern video cards range from 128 to 2048 MB (workstation graphics cards).

• In 2006, the VRAM was based on DDR technology, standing out DDR2, GDDR3 and GDDR4. The memory clock rate is between 400 MHz and 1.6 GHz.

• A very important element of the video memory is the Z-buffer, which manages the depth coordinates in 3D graphics. (Wikipedia, 2007k)


What is a Sound Card?

A sound card is a computer expansion card that can input and output sound under control of computer programs.

• Many computers have sound capabilities built in on the motherboard, while others require these expansion cards if audio capability is desired. (Wikipedia, 2007l) Figure 8. A sound card.


Part 4: Storage Devices


What are Types of Storage Devices?

Storage DevicesStorage Devices

Primary StoragePrimary Storage Secondary StorageSecondary Storage

Read-Only MemoryRead-Only Memory(ROM)(ROM)

Random-Access MemoryRandom-Access Memory(RAM)(RAM)

Figure 9. Classification of storage devices.


What is Primary Storage?

• Primary storage is computer memory that is directly accessible to the CPU of a computer without the use of computer's input/output channels.

• Primary storage is used to store data that is likely to be in active use. (Wikipedia, 2007m)


What is ROM?

• Read-only memory (ROM) is a class of storage media used in computers.

• Data stored in ROM cannot be modified.

• ROM is a non-volatile storage. Data remains unchanged even after switching off the computer. (Wikipedia, 2007n)

• E.g. EPROM, EEPROM Figure 10. An EPROM. (Wikipedia, 2007n)


What is RAM?

• Random access memory (RAM) is a type of data storage used in computers.

• It takes the form of integrated circuits that allow the stored data to be accessed in any order (random).

• Data stored in RAM can be modified.

• RAM is a volatile storage. Data will lose after switching off the computer. (Wikipedia, 2007o)

• E.g. DDRam, DDR-2 RamFigure 11. Two 512 MB DDRam.


What is Secondary Storage?

• Secondary storage is computer memory that is not directly accessible to the CPU of a computer, requiring the use of computer's input/output channels.

• It is used to store data that is NOT in active use. • It is usually slower than primary storage but it al

ways has higher storage capacity.• It is non-volatile. Data remains unchanged even

after switching off the computer. (Wikipedia, 2007p)


Secondary Storage

3.5” Floppy Disk• Data can be read or w

rite• Data capacity:

1.44 MB (Wikipedia, 2007q)

Figure 12. A floppy disk.


Secondary Storage

Hard Disk• Data can be read or w

rite• Speed of disk rotation

usually 7200 rpm• Data capacity :

80GB, 160GB, 250GB, 300GB etc (Wikipedia, 2007r) Figure 13. A Hard disk.


Secondary Storage

CD-Rom CD-R CD-RW

Data can be

Read only Read but write once

Read & write

Data capacity (MB)

650 650 650


Secondary Storage

DVD DVD-R/DVD+R

DVD-RW/DVD+RW

Data can be

Read only Read but write once

Read & write

Data capacity (GB)

Single layer:

4.7

Double layer:8.5

Single layer:

4.7

Double layer:8.5

Single layer:

4.7

Double layer:8.5


What are the Different Between DVD-R and DVD+R?

• The DVD-R format was developed by Pioneer in the autumn of 1997. It is supported by most DVD players, and is approved by the DVD Forum. (Wikipedia, 2007s)

• DVD+R was developed in 2002. • This format is a competing format to the DVD-R f

ormat, which is developed by the DVD Forum, it has not been approved by the DVD Forum, which claims that the DVD+R format is not an official DVD format. (Wikipedia, 2007t)


Secondary Storage

Figure 14. A C-R disk.

Figure 15. A CD-RW disk.


Secondary Storage

Figure 16. A DVD-R disk.

Figure 17. A DVD+RW disk.


Secondary Storage

USB flash drives • They are flash memory d

ata storage devices integrated with a USB interface.

• They are typically small, lightweight, removable and rewritable. (Wikipedia, 2007u)

• Data capacity:512MB, 1GB, 2GB, 4GB, etc

Figure 18. An USB flash drive.


Secondary Storage

Memory Cards• e.g. SD card, CF card,

xD card, Microdrive, Memory Stick

• Data can be read or write

• Data capacity: 512 MB, 1GB, 2GB, 4GB etc

Figure 19. A SD card.


Various Types of Memory Cards

SM Card SD Card CF Card

xD card Memory Stick MicrodriveFigure 20. Various types of memory cards.


Part 5: Output Devices


What is an output device?

• Output devices include any hardware that translate information processed by the computer into a form that humans can understand.


Output Devices

A monitor is a piece of electrical equipment which displays texts and images.

• It generated a temporary record because the record disappear when power off.

• There are 2 major types of monitors: Cathode Ray Tube (CRT) and Liquid Crystal Display (LCD) (Wikipedia, 2007v)

Figure 21. A 14” LCD monitor.


The performance parameters of a monitor are:

1.Luminance 2.Size, measured diagonally

For CRT the viewable size is one inch smaller then the tube itself.

3.Dot pitch Describes the distance between pixels of the same color. In general, the lower the dot pitch (e.g. 0.24), the sharper the picture will appear.


4. Response time The amount of time a pixel in an LCD monitor takes to go from active (black) to inactive (white) and back to active (black) again. It is measured in milliseconds (ms). Lower numbers mean faster transitions and therefore fewer visible image artifacts.

5. Refresh rate The number of times in a second that a display is illuminated.

6. Power consumption 7. Display resolution

The number of distinct pixels in each dimension that can be displayed.


Output Devices

A printer produces a hard copy (permanent human-readable text and/or graphics) of documents stored in electronic form, usually on physical print media such as paper.

• There are 2 major types of printers. They are inject printer and laser printer.

• The resolution of a printer is measured in dots per inch (dpi). The higher the value, the better the quality. (Wikipedia, 2007w)


Output Devices

Inkjet printers operates by propelling tiny droplets of liquid ink onto paper.

• They are the most common type of computer printer for the general consumer due to their low cost, high quality of output, capability of printing in vivid colour, and ease of use. (Wikipedia, 2007x) Figure 22. An HP Inkjet K5400dn

printer. (HP, 2007a)


Output Devices

Laser printer• Laser printers employ

a xerographic printing process.

• Laser printers are available in both colour and black & white varieties. (Wikipedia, 2007y)

Figure 23. An HP LaserJet 1022 printer. (HP, 2007b)


Task 3 (Group Work)

• You are divided into groups of 4.• Select ONE laser printer and ONE inkjet

printers• Compare the features (print speed, print

volume per month, print resolution, printer price, print cost per page) of the laser printer and the inkjet printer.

• Please post your group discussion results in the forum.


Output Devices

• A loudspeaker is an electromechanical transducer which converts an electrical signal into sound. (Wikipedia, 2007z)

Figure 24. Loudspearkers


References

HP. (2007a). HP Officejet Pro K5400dn. Retrieved July 7, 2007, from http://h10010.www1.hp.com/wwpc/hk/zh/sm/WF06b/1090037-1090093-1095469-1095469-12224252-12973294-78107983.html

HP. (2007b). HP Olaser Jet 1022. Retrieved July 7, 2007, from http://h10010.www1.hp.com/wwpc/hk/zh/ho/WF05a/1090037-1090121-1090401-1090401-1091129-12094322.html

Wikipedia. (2007a). Personal Computer. Retrieved July 7, 2007, from http://en.wikipedia.org/wiki/Personal_computer

Wikipedia. (2007b). Input Device. Retrieved July 7, 2007, from http://en.wikipedia.org/wiki/Input_device

Wikipedia. (2007c). Computer Keyboard. Retrieved July 7, 2007, from http://en.wikipedia.org/wiki/Computer_keyboard

Wikipedia. (2007d). Mouse (Computing). Retrieved July 7, 2007, from http://en.wikipedia.org/wiki/Mouse_%28computing%29

Wikipedia. (2007e). Image Scanner. Retrieved July 7, 2007, from http://en.wikipedia.org/wiki/Image_scanner

Wikipedia. (2007f). Microphone. Retrieved July 7, 2007, from http://en.wikipedia.org/wiki/Microphone

Wikipedia. (2007g). Webcam. Retrieved July 7, 2007, from http://en.wikipedia.org/wiki/Webcam

Wikipedia. (2007h). Digital Camera. Retrieved July 7, 2007, from http://en.wikipedia.org/wiki/Digital_camera

Wikipedia. (2007i). Central Processing Unit. Retrieved July 7, 2007, from http://en.wikipedia.org/wiki/Cpu

Wikipedia. (2007j). Motherboard. Retrieved July 7, 2007, from http://en.wikipedia.org/wiki/Motherboard

Wikipedia. (2007k). Video Card. Retrieved July 7, 2007, from http://en.wikipedia.org/wiki/Video_card

Wikipedia. (2007l). Sound Card. Retrieved July 7, 2007, from http://en.wikipedia.org/wiki/Sound_card


ReferencesWikipedia. (2007m). Primary Storage. Retrieved July 7, 2007, from http://en.wikipedia.org/wiki/Primary_storage

Wikipedia. (2007n). Read-only Memory. Retrieved July 7, 2007, from http://en.wikipedia.org/wiki/Read-only_memory

Wikipedia. (2007o). Random Access Memory. Retrieved July 7, 2007, from http://en.wikipedia.org/wiki/RAM

Wikipedia. (2007p). Secondary Storage. Retrieved July 7, 2007, from http://en.wikipedia.org/wiki/Secondary_storage

Wikipedia. (2007q). Floppy Disk. Retrieved July 7, 2007, from http://en.wikipedia.org/wiki/Floppy_disk

Wikipedia. (2007r). Hard Disk Drive. Retrieved July 7, 2007, from http://en.wikipedia.org/wiki/Hard_disk

Wikipedia. (2007s). DVD-R. Retrieved July 7, 2007, from http://en.wikipedia.org/wiki/DVD-R

Wikipedia. (2007t). DVD+R. Retrieved July 7, 2007, from http://en.wikipedia.org/wiki/DVD%2BR

Wikipedia. (2007u). USB Flash Drive. Retrieved July 7, 2007, from http://en.wikipedia.org/wiki/Usb_flash_drive

Wikipedia. (2007v). Computer Display. Retrieved July 7, 2007, from http://en.wikipedia.org/wiki/Computer_display

Wikipedia. (2007w). Computer Printer. Retrieved July 7, 2007, from http://en.wikipedia.org/wiki/Computer_printer

Wikipedia. (2007x). Inkject Printer. Retrieved July 7, 2007, from http://en.wikipedia.org/wiki/Inkjet_printer

Wikipedia. (2007y). Laser Printer. Retrieved July 7, 2007, from http://en.wikipedia.org/wiki/Laser_printer

Wikipedia. (2007z). Loudspeaker. Retrieved July 7, 2007, from http://en.wikipedia.org/wiki/Loudspeaker

Lesson 2 Ppt V6

Technology

Transcript of Lesson 2 Ppt V6