Lesson Notes By Weeks and Term - Senior Secondary 1
Medium of information transmission
Medium of information transmission
Term: 2nd Term
Week: 5
Class: Senior Secondary School 1
Age: 15 years
Duration: 40 minutes of 2 periods each
Date:
Subject: Data Processing
Topic:- Medium of information transmission
SPECIFIC OBJECTIVES: At the end of the lesson, pupils should be able to
INSTRUCTIONAL TECHNIQUES: Identification, explanation, questions and answers, demonstration, videos from source
INSTRUCTIONAL MATERIALS: Videos, loud speaker, pictures, Data Processing for senior Secondary Education by Hiit Plc, WAPB Computer Studies for Senior Secondary I by Adekunle et al, On-line Materials.
INSTRUCTIONAL PROCEDURES
PERIOD 1-2
|
PRESENTATION |
TEACHER’S ACTIVITY |
STUDENT’S ACTIVITY |
|
STEP 1 INTRODUCTION |
The teacher reviews the previous lesson on the disadvantages of wireless communication and the classes of the means of transmitting information |
Students pay attention |
|
STEP 2 EXPLANATION |
He discusses the various mediums of transmitting and receiving information
|
Students pay attention and participates |
|
STEP 3 DEMONSTRATION |
He further lists examples of each medium of transmitting information
|
Students pay attention and participate |
|
STEP 4 NOTE TAKING |
The teacher writes a summarized note on the board |
The students copy the note in their books |
NOTE
MEDIUMS OF INFORMATION TRANSMISSION
There are different modes of receiving and transmitting information. We can receive information in audio, visual or audio-visual forms.
Information that is in the form of sound (which could be voice) is usually called audio. Examples of information in audio form are music in audio tape, CD, DVD, diskettes, voice narrated text documents, radio broadcasts, telephone conversation, voice calls on the GSM network.
Information that we receive in the form of pictures and images are called visual information. Examples are text, graphs and charts in prints (i.e newspapers, magazines, photocards, photo album, books); images transmitted via satellite; pictures on the internet; making representations or drawing diagrams.
This mode of receiving information involves both audio and visual means. Examples are television broadcasts, films (motion pictures) in video tapes, CD and DVD. Other examples are the internet and oral communication.
RADIO
In 1894, the young Italian inventor Guglielmo Marconi began working on the idea of building a commercial wireless telegraphy system based on the use of Hertzian waves (radio waves).
By August 1895, Marconi was field testing his system but even with improvements, he was only able to transmit signals up to one-half mile.
In 1897, he established a radio station on the isle of Wight, England.
In summary, Radio is a means of transmitting information over a long distance; most especially rural areas have access to information transmitted over the radio.
It is all about sending audio messages over a long distance using electromagnetic wave.
TELEVISION
Television is used to transmit both visual and audio messages to large audience over a far distance.
Electronic television was first successfully demonstrated in San Francisco on Sept, 7th, 1927.
The system was designed by Philo Taylor Famsworth, a 21year old inventor who had lived in a house without electricity until he was 14. While still in high School, Famsworth had begun to conceive of system that could be coded onto radio waves and then transformed back into a picture on a screen.
There was also a mechanical television system, which scanned images using a rotating disk with holes arranged in a spiral pattern, had been demonstrated by John Logie.
In summary, Famsworth scanned images with a beam of electrons while John Logie developed a mechanical television.
Television is audio – visual electronic used to transmit both the audio messages and images.
Types of Information Transmission medium, namely:
SATELLITE: In satellite communication, signal transferring between the sender and receiver is done with the help of satellite. In this process, the signal which is a beam of modulated microwaves is sent towards the satellite. Then the satellite amplifies the signal and sent it back to the receiver’s antenna present on the earth surface. All the signal transferring is happening in the space. Thus, this type of communication is known as SPACE COMMUNICATION.
WIRELESS: Wireless communication involves the transmission of information over a distance without the help of wires, cables or any other forms of electrical conductors. The transmitted distance can be anywhere between a few meters ( e.g a television’s remote control) and thousands of kilometers (e.g radio communication).
Devices used for Wireless Communication
CABLE: Cable used for information transmission is Fiber-optics, also called OPTICAL FIBER.
It is a technology that allows light to travel along thin glass or plastic wires. This type of cable is used most commonly in the communication industry, because digital information can be converted into light pulses that move along the length of the wire. Examples of the kinds of information that can pass through a fiber-optic cable are : Telephone calls, the internet and television.
Means of transmitting information
EVALUATION: 1. Discuss three ways in which we can receive or transmit information
CLASSWORK: As in evaluation
CONCLUSION: The teacher commends the students positively