Computer Science Flashcards
Theory (26 cards)
What does the case of the computer do?
The case of the computer holds everything together and keeps the components in place.
How is the computer case similar to the human body?
This is similar to how your skeleton works!
What is the name of a computer part that carries all of its tasks out?
The processor
What is memory/storage in a computer or device?
It is where all your documents, pictures and programs are stored, in the long term memory
What does RAM stand for?
Random Access Memory
What is RAM?
RAM is where the short term memory is stored.It is where the computer stores its current task that is being carried out.
What is the motherboard?
It is the name of a component that keeps everything connected
What is Binary?
Computers communicate and share data using 1’s and 0’s. Also known as machine code. It usually is written in 8 bits.
What are the rules to convert binary to denary?
Always start from the right hand side to the left
The table is as followed:
128 64 32 16 8 4 2 1
Just an example of converting binary to denary
128 64 32 16 8 4 2 1
1 1 0 0 1
The ones with 1 in it you add up so in this case 16+8+1=25
Just an example on how to convert from denary to binary
We draw out the table like usual
128 64 32 16 8 4 2 1
We now have to subtract 25 from each number until it can become a whole number
In this case that would be 16
And 25 – 16 = 9
Then 9- 8=1
Then 1-4 = a negative number! This would mean this is 0.
Since 1-1=0 that means 1 would also be one of the numbers!
So the answer is… 11001!
Name the three main health issues caused by using a computer
Back problems, Eye strain, Repetitive strain injury
How are back problems caused?
Back problems are usually caused by poor posture or sitting in an awkward position when using a computer.
How can you solve back problems?
Solutions can be that you can use a fully adjustable chair, footrests or a screen that can be tilted.
How is repetitive strain injury caused?
Repetitive strain injury is usually damage to the wrists or fingers due to repeated movements over a long period of time.
What can you do to prevent repetitive strain injury?
You can use wrist rests, correct your posture and have a 5 minute break every hour.
How is eye strain caused?
Eye strain is usually caused by staring at a computer screen for a long time. Particularly in poor light, in glare with a flickering screen.
How can you solve/prevent eye strain?
A solution can be that you use screen filters, screens that don’t flicker, take regular breaks and suitable lighting and blinds fitted on windows.
Name 3 of the health and safety legislation
tiltable screens, anti-glare screen filters, adjustable chairs, foot supports, suitable lighting, workstations are not cramped, when working on a computer staff take frequent breaks, appropriate eye and eyesight tests by an optician
What is a computer network?
A network is two or more computers (or other electronic devices) that are connected together, usually by cables or Wi-Fi.
Name the two types of computer network.
WAN ( wide area network), LAN ( local area network)
What are the benefits of network?
Using network allows you to share hardware (printer).Software by allowing computers to run on the same programs on different computers; data so that other people can access shared work and you can access your data from any computer on the network; Network users can communicate by email and instant messenger
What problems can occur with a network?
If the network breaks, this can make a number of tasks it is used for quite difficult.
Viruses can spread to other computer network. There is a danger of hacking particularly with wide area networks. Security procedures are needed to prevent such abuse, e.g. firewall.
What is KERNEL?
A kernel is the core of an operating system that exists in between the software and hardware.
