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Week4   measuring data

Week4 measuring data






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    Week4   measuring data Week4 measuring data Presentation Transcript

    • Understanding Data Data (the plural of datum) are anything in a form suitable for use with a computer. Whatever a computer receives as an input is data. Data are raw facts without any clear meaning. Computers process data and generate information. All data stored and processed by computers are in the form of whole numbers. The purpose of the numbers becomes clear after they are interpreted and displayed by software.
    • Part of the data stored in the computer for the file apple.bmp The apple.bmp File
    • Decimal Number System
    • Binary Number System
    • Bits and Bytes We measure computer information (data) in bits and bytes. Bit is short for binary digit. It is the smallest unit of information that a computer can understand. One bit represents a 1 or 0 digit in a binary numeral or a true or false logical condition. A bit is represented physically by high or low voltage in a circuit or a small magnetized spot on a disk.
    • Bits and BytesByte is short for binary term. A byteusually contains eight bits. It can representa single character, such as a letter, adigit, or a punctuation mark.Because a byte represents only a smallamount of information, we usuallymeasure amounts of computer memoryand storage in kilobytes (one kilobyte is 1024 bytes), megabytes (one megabyte is 1048576 bytes), gigabytes (one gigabyte is 1073741824
    • Bits and Bytes In Bytes In Bits In Bits (Power Notation) 3 1 byte 2 bits 8 bits 10 1 kilobyte (KB) 2 bytes 1024 bytes 20 2 bytes 1024 kilobytes 1 megabyte (MB) 30 2 bytes 1024 megabytes 1 gigabyte (GB) 40 2 bytes 1024 gigabytes 1 terabyte (TB) 50 2 bytes 1024 terabytes 1 petabyte (PB) 60 2 bytes 1024 petabytes 1 exabyte (EB) 70 2 bytes 1024 exabytes 1 zettabyte (ZB) 80 2 bytes 1024 zettabytes 1 yottabyte (YB)
    • Binary, Decimal andHexadecimal Numbers
    •  512 MB = ……………...…....… GB 64 b = …………........……… B 5120 GB = ………....……...…… TB 4096 PB = …….....………...…… EB 0.25 GB = .......………………… MB
    • Monitor Cleaning
    • Keyboard Cleaning
    • Mouse Cleaning
    • Case Cleaning
    • Keep Your PC Cool Buy Quality Hardware Get Power Protection Get an Anti-Virus Program Scan for Other Malware Run the Defragmenter Utility Clean Up Old Files
    • HEALTHY COMPUTER USEMake Yourself Comfortable Put the computer on a flat table at a comfortable height and distance to avoid hurting your eyes; make sure that the display is a bit below your eye level. Put the computer directly in front of you when you work. Make sure you have enough space to operate the different parts of the computer (keyboard, mouse, etc.) easily. If you use a paper holder, put it at about the same height and distance from you as the monitor. Set your chair height so that the keyboard is at (or slightly below) the level of your elbow. You should be able to type comfortably with your shoulders relaxed.
    • HEALTHY COMPUTER USEMake Yourself Comfortable Your knees should be slightly higher than your hips. If necessary, use a foot rest to raise your knees. Set the back of your chair so that it supports the lower part of your spine. Sit straight so that your knees, hips, and elbows are at about 90 degree angles when you work. Do not lean forward or back too far. If possible, use soft, indirect lighting in your computer work area.
    • HEALTHY COMPUTER USETake a Break Change your position often. If you use a computer for a long time, stand up and stretch your wrists, hands, and legs regularly. Take frequent short breaks (for example, two or three minutes every half hour) instead of one or two long breaks.
    • HEALTHY COMPUTER USEEyes and Eyesight Working at a screen for a long time without a break can have effects similar to reading or writing uninterruptedly and may make your eyes feel tired or sore. Every fifteen or twenty minutes, look at an object that is far away to avoid hurting your eyes with too much close work. Put the computer so that sunlight or bright indoor light does not reflect off the screen and hurt your eyes. Have regular eye examinations. Visit a doctor if your body hurts or aches because of too much computer work.
    • BUYING A COMPUTER Your Needs Windows vs. Mac Desktop vs. Laptop Hardware Software Service, Support and Warranty