Lesson Notes By Weeks and Term - Primary 3

Purifying water + Components of the CPU

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Class: Primary 3

Term: 2nd Term

Week: 5

Class: Primary 3

Age: 8 years

Duration: 40 minutes of 3 periods

Date:

Subject: Basic Science and Technology

Topic: Purifying water

  • Components of the CPU

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

  1. Identify the reasons for purifying water
  2. Explain different methods of purifying water
  3. Define and outline the functions of the Arithmetic Logic Unit and Memory unit

INSTRUCTIONAL TECHNIQUES: Identification, explanation, playway method, questions and answers, demonstration, videos from source, experimentation

INSTRUCTIONAL MATERIALS: funnel, stove, water, alum, buckets, charts on methods of purifying water,  

INSTRUCTIONAL PROCEDURES

PERIOD 1 and 2: Purifying water

PRESENTATION

TEACHER’S ACTIVITY

PUPIL’S ACTIVITY

STEP 1

INTRODUCTION

The teacher revisits the previous lesson on qualities of good water and water contaminants

 

Pupils pay attention

STEP 2

EXPLANATION

The teacher then explains the reasons for purifying water

1. to remove water contaminants

2. so that the water may be extra safe

3. to keep us from falling sick or contacting water-borne diseases

4. to improve the taste and odour of the water

Pupils pay attention and participates

STEP 3

DEMONSTRATION

The teacher further explains and demonstrates the methods of purifying water

1. filteration: This is when we remove particles from water using funnels or thin sieves

2. Use of chemicals: this is when we add chemicals like alum to water

3. Boiling: This is when water is cooked in order to make it safe

4. Distillation: this is purifying water by boiling water, cooling it and storing it for later use

 

Pupils pay attention and participate

STEP 4

NOTE TAKING

The teacher writes a short note on the board

The pupils copy the note in their books

 

NOTE

Reasons for purifying water

  1. to remove water contaminants
  2. so that the water may be extra safe
  3. to keep us from falling sick or contacting water-borne diseases
  4. to improve the taste and odour of the water

Methods of purifying water

  1. filtration: This is when we remove particles from water using funnels or thin sieves
  2. Use of chemicals: this is when we add chemicals like alum to water
  3. Boiling: This is when water is cooked in order to make it safe
  4. Distillation: this is purifying water by boiling water, cooling it and storing it for later use

 

EVALUATION:    1. Discuss three reasons why we purify water

  1. Explain two methods of purifying water

CLASS ACTIVITY: Each pupil role plays the method of purification using alum and water in a bucket

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the pupils positively

 

PERIOD 3: Arithmetic and Logic Unit and Memory unit

PRESENTATION

TEACHER’S ACTIVITY

PUPIL’S ACTIVITY

STEP 1

INTRODUCTION

The teacher revisits the previous lesson on the Control unit and its functions

 

Pupils pay attention

STEP 2

EXPLANATION

The teacher then explains the various functions of the Arithmetic and logic unit

1. it performs arithmetic operations: addition, subtraction, increment, multiplication etc

2. It performs logical operations: AND, OR, NOT, XOR etc

3. It accepts operands from accumulator and temporary register

4. it stores the result in accumulator or temporary register

5. it looks after the branching decision

Pupils pay attention and participates

STEP 3

DEMONSTRATION

She explains and demonstrates the functions of the Memory Unit

 

1. it is used for encoding information

2. it is used for storing information

3. it is used for retrieving information

Pupils pay attention and participate

STEP 4

NOTE TAKING

The teacher writes a short note on the board

The pupils copy the note in their books

 

NOTE

Functions of the Arithmetic and logic unit

  1. it performs arithmetic operations: addition, subtraction, increment, multiplication etc
  2. It performs logical operations: AND, OR, NOT, XOR etc
  3. It accepts operands from accumulator and temporary register
  4. it stores the result in accumulator or temporary register
  5. it looks after the branching decision

 

Functions of the Memory Unit

 

  1. it is used for encoding information
  2. it is used for storing information
  3. it is used for retrieving information

EVALUATION:    1. Discuss three functions of the ALU and The Memory Unit.

CLASS ACTIVITY: Pupils in small groups, discuss the functions of the ALU and The Memory Unit

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the pupils positively



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