Lesson Notes By Weeks and Term - Senior Secondary School 1

TERM: 2^nd Term

WEEK: 5

CLASS: S.S. 1

DATE:

SUBJECT: Computer Science
TOPIC: Communication system

Introduction:

Communication system is the same as ICT, which means information, communication and technology. This is the use of technology in processing information. It uses electronic devices (computer) and computer software to store, protect, process, transmit and retrieve information anytime, anywhere.

• Convert: is the changing of data from one form to another e.g signal to digit.
• Store: ICT is able to keep information in a safe place
• Protect: ICT guides data from being damaged or lost
• Process: This performs an action on the data e.g. Arithmetic operation e.t.c

Examples of communication system components

• Computer
• Telephone (GSM)
• Cellular telephone
• Cellular network
• Satellite communication
• Television

Note: Television is a telecommunication system for broadcasting and receiving pictures and sound over long distance.

Elements of Television

• An image source e.g camera, flying sport
• A sound source
• A receiver

INTERNET

This is the worldwide accessible network of interconnected computer networks that transmits data information from one place to another. Internet is defined as a global electronic communication network. It is one of the largest networks that link trillions of computers all over the world. You can access this network via communication devices and media such as modems, cable, telephone lines and satellite.

Here are some of the things one can do on the internet.

• Banking called E-banking 0r Internet Banking
• Invest
• Shop for goods and services
• Watch movies
• Download and listen to music
• Access Educational material e.g. Passnownow.com
• Access source of entertainment and leisure, such as online games, magazines or vacation planning guide
• Access other computer and exchange files, share and edit document with other in real time
• Provide information, photographs or audio or video clips

Benefits of communication system

1. Timely, better and cheaper access to knowledge and information (data). Example – the use of GSM phones is cheaper and timely to reach other people
2. It speeds up the processes of transaction
3. With ICT, distance is no longer a barrier in business transactions and dealings
4. It provides online business services
5. It enhances data security

Disadvantages of communication system

1. Laziness in people because of easy access to data and information
2. It has threatened other disciplines such as shorthand and typewriting
3. Encouragement of advanced free fraud (419)
4. One person can do the job of about 3 persons thereby leading to less need of labour force

ASSESSMENT

1. ICT stands for
   (a) information, communication and technical
   (b) information, community and technology
   (c) information, communication and technology
   (d) introduction, communication and technical
2. Which of these is not an example of communication system?
   (a) telephone
   (b) computer
   (c) television
   (d) car
3. The telecommunication system for broadcasting and receiving pictures and sound over long distance
   (a) telephone
   (b) computer
   (c) television
   (d) car
4. Internet is defined as a global electronic communication
   (a) network
   (b) community
   (c) connection
   (d) nutcase
5. One of these is not a benefit of communication system
   (a) it speeds up the processes of transaction
   (b) It provides online business services
   (c) It enhances data security
   (d) Encouragement of advanced free fraud (419)

ANSWERS

1. c
2. d
3. c
4. a
5. d