Multimedia Topic 4
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Computer Hardware
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Computers can only do three things
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Store and retrieve data; data is information
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Manipulate the data; math and logic functions
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Move data from one device to another; Movie - DVD drive to a monitor
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Computers have two components
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Software - programs for the computer; tells computer how to process information
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Hardware - physical devices
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Light Crystal Display - displays information
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CD-Rom and DVD drives - device that reads optical disks
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Devices tend to be slow
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Used to store data
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Hard drive - stores large volume of data
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Keyboard, mouse, etc.
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Internal hardware
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Central processing Unit (CPU) - process the information
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Brain of the computer
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Processor
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Speed - defined in megahertz or gigahertz
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Mega is million and giga is billion; the old days it was kilo, or thousands
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The time for a computer to process instructions
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Important but not reliable
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CPU can execute multiple instructions at the same time
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CPU has 2,100,000,000 cycles per second
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Random Access Memory (RAM) - temporary memory for the computer
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Directly connected to the CPU
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RAM is very fast; programs are loaded from other devices to RAM
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CPU gets its information from the RAM
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RAM has speed and capacity
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The more the better until you hit a limit
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Speed ranges from 100 MHz to 1,000 MHz
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Double Data Rate (DDR) - DDR, DDR2, and DDR3
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The Chip Set
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Motherboard - all internal components connect to the board
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Web Browsers and Websites
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Web browsers
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Uniform Resource Locator (URL) - the web address displayed in the browser
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As of August 2010
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Handheld devices can display webpages
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Ipads,Epads, and cellular phones
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Iphone and Google's Android
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Called Microbrowsers
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Can use slim down versions of browsers above
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Websites and homepages
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A website has a homepage
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Called index.php or index.htm
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You never enter this. When you go to a website, this is the fist page that is loaded
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Website may have links that branch from the main page
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Websites vary in design
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Types of Websites
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Portal - offers services like free email, weather, etc.
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News - website geared for news
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Informational website - information from government or organizations
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Business/Marketing site - sells products and services
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Educational - teach and train; universities, colleges, and employer training
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Entertainment - games, videos, music, etc.
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Advocacy - websites geared for a cause
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Blog - opinions of website's author
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Personal website - people show the world their interest
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Search Engines - a website that allows people to find specific web content on the internet
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Keywords - are the search criteria
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Every website differs in how websites are referenced and indexed
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Businesses pay money to search engines to display their website at the top of the list
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Most popular search engines
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Google 85.4%
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Yahoo 6.3%
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Bing (Microsoft - replaced MSN) 3.3%
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