Transcript datarep - eduBuzz.org

Data
Representation
N4/N5
Learning Intention
By the end of the lesson, you will



Understand how data is represented on a computer
Know the units used to measure storage capacity and file size
Be able to convert from one unit to another
Success Criteria
Complete Task 1 - Unit Conversions
What is a computer?
 Definition
- An electronic device for
storing and processing data, according to
instructions given to it in a program.
Pros
Cons
• Fast
• Accurate
• Can store a huge amount
of data
• Never Forget
• Can’t think for themselves
• No feeling
• No common sense
Video
Data?
 In
computing, data is the term given to
the numbers, text, graphics, sound &
video that computers process.
 In order to process data, it must be in a
form that computers can understand:
BINARY
Binary

Computers work by switching circuits (transistors)
on and off very quickly.

Computers are known as two-state machines, as
a switch can only be on or off.

The numbers 1 and 0 are used to represent the
on and off positions of the switches.

Each digit (1s or 0s) are called Bits (Short for
Binary digITS)
Units of Binary
 When
referring to memory and storage
capacities, bytes became the basic unit
of measurement. 1 Byte = 8 Bits
Unit
Description
Bit
It is the smallest unit which can be defined in a computer.
Bits (1s or 0s) correspond to simple switches being on or off.
Byte
A byte is a group of 8 bits
Kilobyte (Kb)
Exactly 1024 bytes.
Keep
Megabyte (Mb)
Exactly 1024 Kilobytes.
My
Gigabyte (Gb)
Exactly 1024 Megabytes.
Gold
Terabyte (Tb)
Exactly 1024 Gigabytes.
What’s next?
Petabyte, Exabyte, Zettabyte, Yottabyte…
Changing From one Unit to Another
 Using


the appropriate unit is important
The traffic was dreadful last night. It took me
3300 seconds to drive home.
A high definition movie might require
1,717,986,918 bytes of storage space.