Page 9 - KEC Khaitan C4 Flipbook
P. 9

CHAPTER
                                                                                                         A1
                 COMPUTER MEMORY



















                    Learning Outcomes                                                                           95%


                   The student will be able to:
                       understand the concept of computer memory.        learn about different types of computer memory.
                        learn about online storage.







                           UNDERSTANDING COMPUTER MEMORY


                 You  know that  computers  take  input  as data  and  instructions  and give  output  as
                 information. The entered input (data and instructions) and received output (information)
                 are stored inside a memory which is called computer memory. The data stored in the
                 computer can be stored for a long time and can be retrieved  from the computer’s memory,
                 as and when required.


                 HOW IS MEMORY MEASURED IN A COMPUTER?

                 We use different units of measurement to measure anything, such as gram and kilogram
                 for measuring weight; metre and kilometre for distance; mililitre and kilolitre for liquid.

                 Similarly, the measurement unit or storage unit in which the computer stores information
                 is called memory unit. The basic unit for measuring the memory of a computer is the byte.

                   Byte: A  combination of  eight  bits  makes  up  a
                   byte. For example, 10001011, i.e., 1 byte equals            The human brain can hold about 2.5
                   8 bits.                                                     petabytes of information, equivalent
                                                                                  to a TV show being played for
                   Bit: Data  and  information  on a computer is                approximately 342 years non stop.
                   stored in the form of 0s and 1s . These are called
                   binary digits or bits. A group of 4 bits is known

                   as a nibble (half byte).





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