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Computer Hardware Fill in the blanks on your note.
Hardware Hardware refers to the physical components of the computer system. These physical components are hard, tangible objects.
Parts of the computer Monitor Modem System Unit Mouse Speaker Printer
The Central Processing Unit
CPU Control Unit Arithmetic Logic Unit Input Output Random Access Memory (RAM) Read Only Memory (ROM) Main Memory Secondary Memory (peripheral) Memory stick CD External Hard drive
Input Devices Mouse Keyboard Joystick Touch screen Other computers
Scanner Camera Light pen
Output Devices Screen Printer Sound
Modem: neither input nor output. It is a communication device.
Hardware Notes Input: A device that feeds information into the CPU
Output: It displays information from the CPU
Central Processing Unit
This is the computer and it consists of three parts. Control Unit: coordinates all processing activity (how and when to process data) Arithmetic Logic Unit: performs the mathematical calculations and performs simple logic (compares 2 pieces of information and determines equality Main Memory: where all the data and instructions are stored while the computer is turned on
2 types of Main Memory Read Only Memory (ROM)
Data stored here can be looked at but not changed in any way. It is write protected. ROM often contains software programs built in by the manufacturer Random Access Memory (RAM) It is temporary storage only. When you turn your computer of, all data in RAM is deleted. Ram is where programs that you want to use are downloaded to (including internet files). Therefore RAM plays an important part in how fast your programs will run. EG. A copy of Microsoft Word is downloaded from a secondary storage device, such as your hard drive, to RAM when you want to create a word pro document.
Secondary / auxiliary storage:
Stores information permanently; Acts as an input and output device Examples: Hard drive … may be external Memory sticks or flash drives Compact Disks (CD) … floppy disk??? Cloud / Google drive / Dropbox
Types of printers Dot matrix: used only in industry for printing multiple copy forms; very poor quality, slow, noisy and very inexpensive Ink jet: most popular for everyday use; good quality; considerably slower than a laser printer; relatively inexpensive Disadvantage: when one colour runs out (even is others are still full, ink cartridge must be replaced and the ink can dry up if not used regularly
Types of printers (cont’d)
Plotters: a specialty printer that uses a series of ink pens to create large maps, charts, and graphs Laser printers: very fast; images are precise; costs continue to drop; toner cartridges are expensive to replace
What is a …? Modem: allows computers to exchange information using telephone lines or cable (translator) It is needed for internet access, and faxing What is a Router?
What is a …? Continued Scanner
A device that can read images into a computer It can scan images and text into a document that can be edited by a program Sound Card: Allows a computer to play and record high quality sound Speakers are required to hear the sound
What is a …? Continued Port
A connection on the computer where you plug in external devices such as the mouse or memory sticks USB Port = Universal Serial Bus Digital camera: Takes photos and then use them on your computer Can place photos in documents, web-pages, s, etc.
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