Computer hardware

Published on 12/06/2015 by admin

Filed under Radiology

Last modified 12/06/2015

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2 Computer Hardware

Types of Hardware

Computer	A device for processing information quickly and easily, and comes in many shapes and sizes
Computer Types	Mainframe A large computer, usually the centre of a system. Intelligent peripherals can then be attached to this.
Computer Types	Personal computer (PC) A general purpose machine that enables the user to perform a number of tasks including using word processing, spreadsheets, databases, e-mail, internet access • Desktop computers used in a permanent position usually have a: Tower that holds the computer A monitor A separate keyboard A mouse • Laptop small computer usually contains everything in one box: Computer, monitor and touch screen • Personal Digital Assistant (e.g. a ‘Blackberry’) A small, handheld, wireless computer which performs all the tasks of a personal computer
Main Parts	Central Processing Unit (CPU) The microprocessor that controls the working of the computer in the three main areas of: • The memory Area used to hold data • The arithmetic logic Performs mathematical calculations, including logic functions • Control unit Fetches information Stores the information Interprets the information
	Hard disk Permanent store for: • Programs • Files • Documents, etc.
	Operating system Integral software • Allows the operator to communicate with the computer
	Power supply Electricity is supplied via a step-down transformer
Types of Memory	Random Access Memory (RAM) Temporarily stores the information the computer is working with • Where a program is loaded when it is being used • The higher the RAM the faster the computer will work
	Read Only Memory (ROM) Buy Membership for Radiology Category to continue reading. Learn more here

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