Data Representation In Computers

Question 1

Data representation

Answer 1

Refers to the form in which data us stored, processed and transmitted
Methods used to internally to repsrenst characters stored in computers

Question 2

Types of data stored

Answer 2

Numbers
Text
Graphics
Sound

Question 3

Digitization

Answer 3

Process of converting information such as text, numbers, photos or music into digital data that can be manipulated by electronic devices

Question 4

Bit

Answer 4

The 0s and 1s used to represent digital data are referred to as binary digit from this term we get the word buy that stands for binary digit

A bit is a 0 or 1 used in the digital representation of data

No numeral like 2 exists in the system so the number two is reprenst in binary as 10

The ASCII code for an uppercase A is 1000001

A group of 8 bits is called a byte

Question 5

Representing graphics

Answer 5

Pixels are tiny dots of colors that collectively paint a graphic image on the computer screen

1 pixel = 256 bits

Question 6

Bits and bytes

Answer 6

Bits: data rates such as Internet connection speeds and movie download speeds

Bytes: for file sizes and storage capacities

Kilobyte: used when referring to the size of small computer files (104 KB)

Megabit: used for faster data rates. Internet connection (50Mbps)

Megabyte: used when referring to the size of files containing photos and videos (3.2 MB)

Gigabit: used for really fast network speeds (100 Gbit)

Gigabyte: used to refer to storage capacity (16GB)

Question 7

Number system

Answer 7

Is a writing system for expressing numbers ie a mathematic notation for representation numbers of a given set, using digits or other symbols in a consistent manner

Non positional: wash symbol represents same value regardless of its position in numbers. Eg roman numbers

Positional: easy to perform arithmetic compared to non positions. Use the method of place value ie the position of a disgusting affects its meaning.

Question 8

Considerations that Determines the value of each digit in a number

Answer 8

The digit itself
The position of the digit
The base of the number system

Question 9

Position number system used in computer

Answer 9

Decimal
Binary
Octal
Hexadecimal

Question 10

Advantages of hexadecimal

Answer 10

Shorter, particularly for long computer word lengths

More convenient when the word length is divisible by 4 but not by 3

Question 11

Advantages of octal

Answer 11

Easier to derive from a binary number
Cannot be confused with names or word
Converting octal numbers to decimal is simpler since the digits need not be changed
Octal arithmetic is simpler and less confusing than hexadecimal arithmetic