Computer Studies ICS Notes Form 1 – 4 (O’Level Form 1 – 4 Computer Notes)
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What is computer studies?
A computer study is a subject which deals with features of computers and the ways and methods of using it.
What is a computer?
1. Is an electronic machine that accepts data from an input device performs arithmetic and logical operations according to predefined program and finally transfers the processed data to any output device.
2. An electronic machine that processes raw data to generate (produce) information.
2. Is an electronic machine that receives (accepts) input (raw data), processes it, and then produces output (information)
3.  Is an electronic machine that can be programmed to accept data (input) and process it into useful information (output)
4.  Is an electronic machine (device) that works under the control of stored programs, automatically accepting and processing data to produce information.
5.  Is an electronic machine that operates (works) under the control of instructions(programs) stored in its main memory, that can accept data (input), manipulate the data according to specified rules (process), produce results or information (output), and store the results for future use.
A good definition of computer contains the basic functions of a computer i.e. input, process, Storage, Output.
A COMPUTER BLOCK DIAGRAM
HOW A COMPUTER WORKS
All digital computers work essentially the same way.
A human operator uses input equipment to enter data and instructions into the computer. The processor then performs manipulation on the data, while the memory stores information during
processing. The results then are sent to the output equipment, which presents them to the user. File storage devices enable information to be saved for future use.
Computer Studies ICS Notes Form 1 – 4 (O’Level Form 1 – 4 Computer Notes)
Computer Notes (ICS) Form One All Topics
Computer Form Two (ICS) Notes – All Topics
Computer Notes (ICS) Form Three – All Topics
Form Four Computer Notes (ICS) – All Topics
CHARACTERISTICS (FEATURES) OF A COMPUTER
1. It is very fast,
3. It is very accurate and reliable
4. It can work continuously without getting tired or bored.
5. It can work on and store large amounts of data items
6. It can solve any problem if a relevant set of instructions is input,
7. It is able to access or recovers, retrieve large volumes of data.
8. It is able to communicate with other computer systems in a network.
ADVANTAGES OF COMPUTER
1. It works at a very high speed
2. Its results are very accurate and reliable
3. It can work continuously without getting tired or bored
4. It can work on the stored large amounts of data items
5. It can solve any problem if a relevant set of instructions is input, (computer never think, bad programs will also produce bad output GIGO –garbage in garbage out)
6. It is flexible
7. It reduces paper work significantly.
8. It reduces number of employees in organizations.
9. It uses a small office space
10. It is automatic.
11. It allows fast retrieval of information from a storage space.
12. It can store information efficiently
13. Computers can move information very quickly from one person to another.
Disadvantages of Computer
1. It is costly
2. It becomes outdated very fast due rapid changes in computer technology, hence it leads to capital loss
3. It causes loss of employment in certain fields.
4. It can fail. Such failures can cause loss of life e.g in traffic control system.
5. Too much work at the computer causes nerve injuries.
6. Loss of employment
7. Loss of secrets
8. Eye damage
9. Loss of data.
Computer Studies ICS Notes Form 1 – 4 (O’Level Form 1 – 4 Computer Notes)
Computer Notes (ICS) Form One All Topics
Computer Form Two (ICS) Notes – All Topics
Computer Notes (ICS) Form Three – All Topics
Form Four Computer Notes (ICS) – All Topics
