pptx, 2.1 MB
pptx, 2.1 MB

NEW J277 SPECIFICATION

Here you will find easy to follow revision sheets which will help your students to recap the topic:

1.2 Storage and Memory which includes:

  • The need for primary storage
  • The difference between RAM and ROM
  • The purpose of ROM in a computer system
  • The purpose of RAM in a computer system
  • Virtual memory
  • ¨ The need for secondary storage
  • ¨ Common types of storage:
    o Optical
    o Magnetic
    o Solid state
    ¨ Suitable storage devices and storage media for a given application
    ¨ The advantages and disadvantages of different storage devices
    and storage media relating to these characteristics:
    o Capacity
    o Speed
    o Portability
    o Durability
    o Reliability
    o Cost

¨ The units of data storage:
o Bit
o Nibble (4 bits)
o Byte (8 bits)
o Kilobyte (1,000 bytes or 1 KB)
o Megabyte (1,000 KB)
o Gigabyte (1,000 MB)
o Terabyte (1,000 GB)
o Petabyte (1,000 TB)
¨ How data needs to be converted into a binary format to be
processed by a computer
¨ Data capacity and calculation of data capacity requirements

Numbers
¨ How to convert positive denary whole numbers to binary numbers
(up to and including
8 bits) and vice versa
¨ How to add two binary integers together (up to and including
8 bits) and explain overflow errors which may occur
¨ How to convert positive denary whole numbers into 2-digit
hexadecimal numbers and vice versa
¨ How to convert binary integers to their hexadecimal equivalents
and vice versa
¨ Binary shifts

Characters
¨ The use of binary codes to represent characters
¨ The term ‘character set’
¨ The relationship between the number of bits per character in a character set, and the number of characters which can be represented, e.g.:
o ASCII
o Unicode
Images
¨ How an image is represented as a series of pixels, represented in
binary
¨ Metadata
¨ The effect of colour depth and resolution on:
o The quality of the image
o The size of an image file
Sound
¨ How sound can be sampled and stored in digital form
¨ The effect of sample rate, duration and bit depth on:
o The playback quality
o The size of a sound file

¨ The need for compression
¨ Types of compression:
o Lossy
o Lossless

The revision sheets include over 50 exam questions at the end of each topic to help the students recap their revision and apply it to a question.

Enjoy!

Review

5

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nihad65

3 years ago
5

Very good revision resources and my year 11 students said they are very useful for their revision before mocks next week.

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