Lesson Notes By Weeks and Term - Senior Secondary 1

Computing devices (20th century till date)

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Term׃ 1st Term

Week: 6

Class: Senior Secondary School 1

Age: 15 years

Duration: 40 minutes of 2 periods each

Date:    

Subject:                Computer Studies and ICT

Topic:-  Computing devices(20th century till date)

SPECIFIC OBJECTIVES: At the end of the lesson, pupils should be able to

  1. Explains the features, components and use of the computing devices in the 20th century till date

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 Computing devices(Pre-computer age -19th century)

Students pay attention

STEP 2

EXPLANATION

He explains the features, components and uses of the first and second generation of computers

 

Students pay attention and participates

STEP 3

DEMONSTRATION

He explains the features, components and uses of the third generation of computers

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

COMPUTING DEVICES(20th century till date)

FIRST GENERATION

The first generation computers were developed between 1940s and 1950s.  Computers of that generation were characterized by:

  1. They used vacuum tubes.
  2. They were very large and expensive.
  3. They were very bulky.
  4. They had a low retentive memory
  5. They generated a lot of heat due to the use of vacuum tubes.
  6. They had reliability problem.

Examples of first generation computers are: ENIAC (Electronic Numerical Integrator and Calculator), EDVAC (Electronic Discreet Variable Automatic Computer), EDSAC (Electronic Delayed Storage Automatic Computer) and IBM 650.

SECOND GENERATION

Second generation computers were developed between 1950s and 1960s. In this generation, transistors were used instead of vacuum tubes.  Second generation computers utilized primary discrete TRANSISTORS.  They had limited capability but were more advanced than the first generation computers.

The following could be noted of second generation computers.

  1. They were more reliable than first generation.
  2. They could perform calculations.
  3. They had a more efficient storage facility.
  4. They generated lesser heat when compared with first generation computers.

Examples of this generation are: NCR 304 (National Cash Register 304) and IBM 605.

THIRD GENERATION

Third generation computers were developed between 1960s and 1970s. In this generation, Integrated circuits were used in place of vacuum tubes and transistors. Integrated circuits (IC) are produced as a single chip containing dozens of components fused together in a single process. In this generation, SSI (Small Scale Integration) and MSI (Medium Scale Integration) were used. In SSI, components in tens were fused as a single unit on a chip and in the MSI components in hundreds are fused as a single unit on a chip.

The following can be noted in third generation computers:

  1. Faster input and output.
  2. Increased storage capability.
  3. Increased process capability.
  4. Ability to display pictures and musical sound.

Examples of third generation computers are IBM360 and IBM370.

 

EVALUATION:    1a. State the features and components of the first and                                                                    second generations of computer

  1. Give one example of each

                                                2a. State the features and components of the third                                                                                           generations of computer

  1. Give an example of the third generations of computer

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively