Computers

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Computers

  1. 1. Computers Students will be able to Explain how information is stored Compare hardware and software Describe computer networks Explain computer protection procedures Page 123
  2. 2. What is a Computer? <ul><li>A device that stores, processes, and retrieves information </li></ul>123
  3. 3. Binary System <ul><li>System of only 1 or 0. </li></ul><ul><li>Base 2 (0 or 1) vs our system base 10 (0-9) </li></ul>124
  4. 4. Bits, Bytes, … <ul><li>Each 1 or 0 = 1 Bit </li></ul><ul><li>8 bits together = Byte </li></ul><ul><li>1000 Bytes = Kilobyte </li></ul><ul><li>1 million Bytes = Megabyte </li></ul><ul><li>1 billion Bytes = Gigabyte </li></ul><ul><li>1 trillion Bytes = Terabyte </li></ul><ul><li>1 x 10 20 = Exabyte </li></ul>124
  5. 5. Computer Hardware <ul><li>Physical parts that allow the computer to receive, store, and present information </li></ul>125
  6. 6. Central Processing Unit (CPU) <ul><li>Computer Brain </li></ul><ul><li>Directs all actions </li></ul><ul><li>Collects all information </li></ul>125
  7. 7. Input Devices <ul><li>Keyboard </li></ul><ul><li>Mouse </li></ul><ul><li>Joystick </li></ul><ul><li>Pen </li></ul><ul><li>Scanner </li></ul><ul><li>Microphone </li></ul><ul><li>Touch Screen </li></ul><ul><li>Modem </li></ul><ul><li>Often connected by a USB port to CPU </li></ul>125
  8. 8. Output Devices <ul><li>Monitor </li></ul><ul><li>Projector </li></ul><ul><li>Printer </li></ul><ul><li>Speakers </li></ul><ul><li>Modem </li></ul><ul><li>Often connected by a USB port to CPU </li></ul>125
  9. 9. Internal Memory <ul><li>Read Only Memory (ROM) </li></ul><ul><li>Can not be changed! </li></ul><ul><li>Instructions for basic operations </li></ul><ul><li>Random Access Memory (RAM) </li></ul><ul><li>Temporary memory storage </li></ul><ul><li>Used to run programs </li></ul><ul><li>All information is lost after power is turned off </li></ul>126
  10. 10. External Memory <ul><li>Disk storage </li></ul><ul><li>Stores memory even after power is off </li></ul>127
  11. 11. Computer Software <ul><li>Set of instructions that directs the hardware to perform certain tasks </li></ul>128
  12. 12. Programmer <ul><li>Person who creates software programs </li></ul>129
  13. 13. Information Superhighway <ul><li>Computer Networks </li></ul><ul><li>Group of computers that are all connected together </li></ul><ul><li>Allows people to share information and software </li></ul><ul><li>Types </li></ul><ul><li>Local Area Network (LAN) </li></ul><ul><li>All computers at one site </li></ul><ul><li>Wide Area Network (WAN) </li></ul><ul><li>Many distant computers working </li></ul>132
  14. 14. Internet <ul><li>Millions of computers all linked together </li></ul><ul><li>Began </li></ul><ul><li>1969 for the military </li></ul><ul><li>Expanded to include college professors </li></ul><ul><li>1993 general public was allowed on via </li></ul><ul><li>Internet Service Providers (ISP) </li></ul><ul><li>World Wide Web (1989) </li></ul><ul><li>System for sharing files, images, text, sound… on special files called pages </li></ul>133
  15. 15. Safety <ul><li>Private Data </li></ul><ul><li>Credit card, records, purchases… </li></ul><ul><li>Encryption software to protect customer </li></ul><ul><li>Viruses </li></ul><ul><li>Programs that destroy data on your computer </li></ul><ul><li>Personal Safety </li></ul><ul><li>Chat rooms, FaceBook, MySpace… </li></ul><ul><li>Passwords </li></ul><ul><li>4 Digits = 1.5 minutes to break </li></ul><ul><li>8 Digits = 200 years </li></ul><ul><li>Intellectual Property </li></ul><ul><li>Companies protection from theft </li></ul>134
  16. 16. Cloud Computing <ul><li>Data on computers that can be accessed anywhere there is a signal. </li></ul>
  17. 17. Question of the Day <ul><li>Write an advertisement for a new software application. In your ad, give your application a name, explain what it does, and describe the features that would appeal to customers. </li></ul>

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