1. Data Representation - Numbers

Question 1

Data

Answer 1

Basic values or facts

Question 2

Information

Answer 2

Data that has been organised or processed in a useful manner

Question 3

Multimedia

Answer 3

Several different media types

Question 4

Data compression

Answer 4

Reducing the amount of space needed to store a piece of data

Question 5

Bandwidth

Answer 5

The number of bits or bytes that can be transmitted from one place to another in a fixed amount of time

Question 6

Analogue data

Answer 6

Continuous representation, analogous to the actual information that it represents

Computers cannot work well with analogue data –> reason for digital data

Question 7

Digital data

Answer 7

Discrete representation, breaking the information up into separate elements

Best data form for computers

Breaks data into pieces and represents those pieces separately –> approximates the precise values

–> computers are finite, so cannot precisely represent an infinite world –> we represent enough of the world to satisfy our practical needs

Question 8

How to represent numbers

Answer 8

Computers use electrical current to represent data

–> Two options: On, Off, represented by 1 and 0 –> BASE 2

Question 9

Binary Baics

Answer 9

One bit –> 1 or 0

–> represents two states

So: –> Two bits –> can represent 4 states

n-bits –> represent 2**n states

Number of bits gives the range and accuracy of numbers that can be dealt with