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JSS2: COMPUTER STUDIES - 1ST TERM

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  1. Computer Software | Week 1
    3Topics
    |
    1 Quiz
  2. Operating System | Week 2
    9Topics
    |
    1 Quiz
  3. Computer Memory: Primary And Secondary Memory | Week 3
    5Topics
    |
    1 Quiz
  4. Computer Memory II: Secondary / Auxiliary / External Memory | Week 4
    3Topics
    |
    1 Quiz
  5. Number System I | Week 5
    4Topics
    |
    1 Quiz
  6. Number System II | Week 6
    2Topics
    |
    1 Quiz
  7. Units of Storage In Computer | Week 7
    3Topics
    |
    1 Quiz
  8. Problem Solving Skills With Computer | Week 8
    7Topics
    |
    1 Quiz
  9. Computer Programming Languages | Week 9
    3Topics
    |
    1 Quiz
Lesson Progress
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8 bits =  1 byte

1000 bytes =  1kilobyte

1000 kilobytes =  1 megabyte

1000 megabytes = 1 gigabyte

1000 gigabytes = 1 terabyte

Kilobyte: abbreviated as KB is a unit of measurement equivalent to one thousand bytes of computer memory or disk capacity. A byte is a value which is represented by 8 bits and a bit is a binary digit comprising of either 0 or 1. In computer data storage, you are allowed a total of 1024 bytes before you use up 1KB. In decimal systems, kilo stands for 1000 but the computer world is based on a binary system of twos instead of tens. So, a kilobyte is actually 1,024 bytes.

Megabyte: abbreviated as MB is a unit of measurement equivalent to 1024 Kilobytes (1024 x 1024 bytes) meaning that you can use over 1 million bytes before you use up one MB.

Gigabyte: which is abbreviated as GB is a unit of measurement approximately equal to one billion bytes. Gigabyte is the most common term used to describe the size of a hard drive and memory these days. In 1995, people that had up to 10GB hard disk capacity were regarded as big shorts in computing in Nigeria but today, we talk about 500 GB, Terabyte, and Pet byte.

Terabyte: abbreviated as TB is a unit of measurement approximately to one trillion bytes. All of the books in a standard University library can be accommodated in 1TB and you will still have unused spaces.

Petabyte: Many years to come, we may not have finished using a Terabyte, that is a trillion bytes. A petabyte is a thousand trillion bytes. Old people in the villages refer to Petabyte as “count and die”.

Classwork:

1. Convert 4 bytes to bit

2. Convert 40 gigabytes to megabyte

Solution:

1. Since 1 byte = 8 bits

4 bytes = \( \frac{8}{1} \scriptsize \: \times \: 4 \\ \scriptsize = 32 \: bits\)

2. Since 1 gigabyte = 1000 megabytes

40 gigabytes = \( \frac{1000}{1} \scriptsize \: \times \: 40 \\ \scriptsize = 40,000 \: megabytes\)

Evaluation:

1. Convert 8 bytes to a bit

2. How many kilobytes make 1 gigabyte

3. 70 megabytes is equivalent to how many kilobytes?

Solution:

1. Convert 8 bytes to a bit

1 byte = 8 bits

Therefore, 8 bytes = 8 x 8 = 64 bits

2. 1000 megabytes = 1 gigabyte

Since 1000 kilobytes = 1 megabyte

1 gigabyte = 1000 x 1000 = 1,000,000 kilobytes

3. 70 megabytes is equivalent to how many kilobytes?

1000 kilobytes = 1 megabyte

70 megabytes = 70 x 1000 kilobytes

Therefore,70 megabytes = 70,000 KB

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