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Data Representation

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by

Denise Herreen

on 24 May 2014

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Transcript of Data Representation

What? Why? How?
Tell me more!

Why do computers use Binary?
01110001001010111010100010........010001111101010001......101010100111...101010001010111....1010101110010101010
Activity
What is Binary?
How do computers use Binary?
When we give the computer an instruction, such as press the letter
a
there is a code that gives the letter a number which the computer can use to translate to binary to send the instruction to display the letter
a
onto the screen. This happens so quickly that you don't even notice a delay.
Binary Basics
Count the Dots
View the video
Its a
NUMBER SYSTEM
! Just like the number system we are all used to ...... base 10 (we use the numbers 1, 2, 3, 4, 5, 6, 7, 8, 9, 0) to count and for most aspects in our daily lives. Computers use BINARY which is a number system just like decimal only it uses just 2 NUMBERS -
ZERO AND ONE or 0 & 1
)
Computers are not smart, they just do what we tell them. Computers need a number system that allows them to use electricity to represent our data. Electricity is perfect for this because it can be switched ON or OFF which represents 1 or 0. So computer processors consist of switches that can be ON (1) or OFF (0).
01110001001010111010100010........010001111101010001......101010100111...101010001010111....1010101110010101010
a
01000001
Count the dots
- activities designed to re-inforce how computers deal with binary and how the binary number system works:
(worksheets can be found at:
http://csunplugged.org/binary-numbers)
Thanks to CS-unplugged for the video and worksheet resources
.
Full transcript