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10 Cards in this Set
- Front
- Back
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How much access to computers is there in schools?
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– Access varies. . .
• One or more stand alone computers • Computer learning centers • A computer workstation • Centrally located computer lab • Mobile technology options for checkout – NEA study (2008) • Ratio: 3.8 students per computer • Great disparity in equitable access • Many are outdated and unable to run software |
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What is a computer system?
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– The computer and other support devices
• Receive the information • Process the information • Output the information in usable form – Processing takes place in the CPU • Control Unit • Arithmetic logic unit • Memory Unit – RAM – ROM |
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What is memory and why do I care?
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What is memory and why do I care?
– Computer system works with Binary Code • ASCII • 0s and 1s • Binary character is a bit • Eight bits = byte – Byte • Represents one alphabetic or numeric character • Unique combination of 0s and 1 = each • 01000001 = A – Amount of information a device can hold • Kilobytes (K), Megabytes (MB) and Gigabytes (G) |
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What is processing speed and why do I care?
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– How fast the data is moved in and out of memory
• Megahertz (MHz) – One million cycles per second • Gigahertz (GHz) – One billion cycles per second – Current computers • Entry level - 2 GHz • Top level - 4 GHz – Cache • Temporary storage • Provides quick access to information |
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What is a peripheral device and why do I care?
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– Inputs the information
• Input devices – Outputs the information • Output devices – Stores the information • Storage devices |
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What are examples of input devices?
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– Keyboards
– Mice (joysticks, pointing sticks) – Touch screens – Scanners – Graphics tablets – Digital camera (still and video) – Video input: Webcams – Audio input: Microphones; midi keyboard – Electronic whiteboards – PDAs – Clickers – Cell phones |
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What are examples of output devices?
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– Computer monitors
– Printers – Speakers – Projection units – Document cameras – Interactive whiteboards – Portable media players |
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What are examples of storage devices?
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– Internal storage
• hard drive – External storage • External hard drives • USB drives • Optical disc options – CD; CDR, CDRW – DVD – Blu-ray disc • Flash memory |
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How do I make connections?
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– USB connections
• Fast connections for an array of devices • Not all created equal – 1.1 fast – 2.0 faster – 3.0 fastest transfer – USB hub • Needed when there are more devices than ports |
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How can I adapt hardware for students?
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– Monitor adaptations
• Screen magnifiers • Anti-glare filters • Monitor mounts – Keyboard adaptations • Arm and wrist supports • Alternate keyboards – Mouse adaptations • Joysticks • Touch screens |
