Computer Science Pack Flashcards
What is meant by a Denary System?
Number system based on the number 10
What is meant by a Binary System?
Number system based on the number 2
What are the placeholder values for binary?
128, 64, 32, 16, 8, 4, 2, 1
What is the process for converting binary to denary?
Add up the placeholder values where a 1 appears underneath it
What is the process for converting denary to binary?
Place a 1 if the value you have is smaller than the placeholder value. Then subtract your value by the placeholder value.
IF your number is smaller than the placeholder value, just put a 0 in.
How many bits in a nibble?
4
How many bits in a byte? 1
8
List all the memory sizes from largest to smallest 2
PB TB GB MB KB B
What number do you multiply/divide by to convert measurement units?
1024
What is a computer system?
A computer system is made up of software, data, hardware, communications and people/users
What is a subsystem?
A sub-system is a system that can be divided up into smaller parts.
Each sub-system can be further divided into sub-systems and so on until each sub-system just performs a single action.
Year 10:
What base system does Hexadecimal use?
Base 16
Year 10:
Why do you use Hexadecimal?
It is easier to remember than Binary for a programmer.
Year 10:
Give an example of where you use Hexadecimal numbers.
To represent colour codes for websites
What is an algorithm?
It is a sequence of steps that follow a logical order to solve a problem
What is data transmission?
is data being passed over a short distance or a long distance.
Give an example of data transmission over a short distance
Computer to printer
Give an example of data transmission over a long distance
Over a telephone network
How many factors need to be considered when transmitting data?
3
State how computers avoid errors during transmission
Each factor has to be agreed by both the sender and receiver to work
State the 3 factors that need to be considered when transmitting data
- The direction of the data transmission
- The method of transmission
- The method of synchronisation between devices
