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A very general overview about computers, short introduction, for students at the HS level..

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  1. 1. Computers - An Overview Rita Ester
  2. 2. What is a Computer ? <ul><li>Electronic device </li></ul><ul><li>Executes the instructions of a program (stored in it‘s memory) </li></ul>
  3. 3. What a Computer does? <ul><li>Accepts input (=data) </li></ul><ul><li>Processes data according to a program (=instructions) </li></ul><ul><li>Produces output (=information) </li></ul><ul><li>Stores results in memory (RAM) or in storage devices </li></ul><ul><li>Allows communication with other computers </li></ul>Information Processing Cycle
  4. 4. Information Processing Cycle <ul><li>Not shown here: </li></ul><ul><ul><li>Communication with other computers </li></ul></ul>©
  5. 5. Some Basic Terms <ul><li>Hardware </li></ul><ul><ul><li>the physical parts of the computer. </li></ul></ul><ul><li>Software </li></ul><ul><ul><li>the programs (instructions) that tell the computer what to do. </li></ul></ul><ul><li>Data </li></ul><ul><ul><li>individual facts like first name, last name, street address, city. </li></ul></ul><ul><li>Information </li></ul><ul><ul><li>data which has been put together into a useful form, like a complete mailing address </li></ul></ul>
  6. 6. Why is a Computer Powerful? <ul><li>Speed </li></ul><ul><ul><li>billions of actions per second. </li></ul></ul><ul><li>Reliability / Consistency </li></ul><ul><ul><li>highly reliable components </li></ul></ul><ul><li>Accuracy </li></ul><ul><ul><li>Error free processing </li></ul></ul><ul><li>Storage </li></ul><ul><ul><li>keeps huge amounts of data </li></ul></ul><ul><li>Communication </li></ul><ul><ul><li>increases the power of one computer </li></ul></ul>
  7. 7. Source <ul><li>http :// www . jegsworks . com / Lessons /lesson1-2/lesson1-1.htm </li></ul>