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How Computers Store Data. TERMS. discrete data continuous data, bi-stable device, number system, binary number system, denary number system human-readable data machine –readable data natural numbers whole numbers, integers real numbers, magnitude base, number, digit. QUIZ.

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terms
TERMS
  • discrete data
  • continuous data,
  • bi-stable device,
  • number system,
  • binary number system,
  • denary number system
  • human-readable data
  • machine –readable data
  • natural numbers
  • whole numbers, integers
  • real numbers, magnitude
  • base, number, digit
slide3
QUIZ
  • Classify each set of data as discrete or continuous.
  • 1) The number of suitcases lost by an airline.
  • 2) The height of corn plants.
  • 3) The number of ears of corn produced.
  • 4) The number of green M&M's in a bag.
  • 5) The time it takes for a car battery to die.
  • 6) The production of tomatoes by weight.
quiz answers
QUIZ ANSWERS
  • 1) Discrete. The number of suitcases lost must be a whole number.
  • 2) Continuous. The height of corn plants can take on infinitely many values (any decimal is possible).
  • 3) Discrete. The number of ears of corn must be a whole number.
  • 4) Discrete. The number of green M&M's must be a whole number.
  • 5) Continuous. The amount of time can take on infinitely many values (any decimal is possible).
  • 6) Continuous. The weight of the tomatoes can take on infinitely many values (any decimal is possible).
why do computers store data
Why do computers store data?
  • For processing
    • Temporarily
      • using Random Access Memory (RAM)
  • For later use
    • permanently or semi-permanently
      • using secondary storage devices and media

Computers do not store data the way we see it, but in the form of binary digits

why binary digits
Why binary digits?
  • The computer is an electronic device
  • The computer is a digital device
  • Electronic
    • the computer uses electricity to work
  • Digital
    • the use of binary digits to store data
the computer s memory
The computer’s memory
  • The computer’s memory is made up of tiny two-state electronic devices called bi-stable devices.
  • A bi-stable devicecan exist in only one of two possible states i.e. on or off.
  • Bi-stable devices respond to the presence or absence of an electric current:
    • Absence of an electric current - off state
    • Presence of an electric current - on state
binary d igits and data
Binary digits and data
  • Binary digITS (BITS)
      • 1  ON
      • 0  OFF
  • This is why data is stored in the form of binary digits (bits)
  • Input data is converted to binary digits in order to be processed and stored
binary digits and data cont d
Binary digits and data (cont’d)
  • Information for the user is converted from binary digits into human-readable form
  • Every character on the keyboard can be represented internally using a combination of 8 bits or 1 byte
  • The computer uses various representation schemes to convert data to binary form
slide10

Numeration/number system: any notation for the representation of numbers

  • human-readable format is a representation of data or information that can be naturally read by humans
  • Machine readable format-
homework
Homework
  • Logon to IT for CSEC
    • Read and take notes on pages 55 – 56
homework cont d
Homework (cont’d)
  • All ___________ that is _________ into a computer system must be

_________ temporarily in ________________. The computer’s

___________ is made up of ___________________ which can exist in only one

of _______ possible __________. As a result, the _________________ one and

zero are used to represent the ________ and __________ states respectively.

___________ data is therefore _____________ to its binary __________________ in order to be

_______________ and ____________. It is then _____________ from ______________ back to

its original form in order to be ___________ to the user.Fill in the blanks in the above paragraph using the words given in the list below. Remember that a word may be used more than once.Main memory, data, representation, memory, stored, bistable devices, converted, states, output, two, binary digits, input, on, processed, off, binary.