grade 7 computer science notes

GRADE 7 TERM 1
COMPUTER SCIENCE LESSON NOTES
FOUNDATION OF COMPUTER SCIENCE
Computer concepts

Definition
1. Computer
An electronic device that accepts data from a user, Processes the data using given
instructions, stores it and presents it in a desired format
2. Data
Raw facts which include numbers, texts, images, audios or videos that input into a computer
3. Information
Data that has been processed and made meaningful to the user
Examples of computers
1. Notebooks
2. Smartphones
3. Macbook
4. PDA
5. Desktop computer
6. Laptop
7. Ipad
8. Tablet
9. Smartwatch
10. Server
 Each examples of computers have different features that enable them to serve
different
Characteristics of a computer
1. Speed
A computer works at a higher speed than human beings
2. Storage
Computers have storage space that can hold large amounts of data and information
3. Multitasking
Computers can perform more than one tasks at the same time
4. Accuracy
Computers give information without errors if given the correct data and instructions
5. User dependant
Computer cannot work without instructions from the user
6. Versatility
Computers have ability to perform a variety of task(complex and simple)
7. Reliability
The electronic components in modern computer have very low failure rate. The modern
computer can perform very complicated calculations without creating any problem and
produces consistent (reliable) results.
8. Diligence
Computers, unlike frail human beings, do not become bored or tired or lose concentration
when performing highly repetitive work. If a computer has to perform a certain calculation on

a million numbers, it will calculate the first and the last with equal diligence. This enables
trust to be placed in the results generated by computers, and confidence to be replaced in their
ability – neither of which can always be replaced in humans!
Function of a computer
1. Stores data and information
2. Process data into information using given instructions
3. Accepts data from the user
4. A computer gives out information to the user

Uses of computers to perform daily activities
1. Accessing internet
2. Paying online bills
3. Home/school tutoring
4. Stock taking
5.
6.
7.
Stages of computer processing cycle

Computer processing cycle is the stage or events that takes place from the time data is entered
into the computer to the time is given to the user.
Model of a computer

Advantages of using a computer
1. Computer process data faster than human beings
2. Computers keep data and information secure
3. Computers can store a lot of data in a small physical space
4. Computer can do the same repeatedly without getting tires or bored
5. Computer are able to perform different types of jobs at the same time
6. A computer is reliable because it consistently does what it is supposed to do.
7. Computers have a very big storage capacity and can store data and information for a
very long time
8. Information given by computers after processing has no error because they work
under instructions and are always accurate