### Lesson Plan: Purifying Water & Components of the CPU
**Grade Level**: Primary 3
**Subject**: Basic Science and Technology
**Duration**: 60 minutes
#### **Objectives:**
By the end of the lesson, students should be able to:
1. Understand the importance of clean water.
2. Describe simple methods to purify water.
3. Identify the main components of a computer's CPU.
4. Explain the function of each CPU component.
#### **Materials Needed:**
- Samples of dirty and clean water
- Water filter, boiling equipment (if feasible and safe), and clean cloth for filtration demonstration
- Chart or projector with CPU components visual
- Sticky notes or small cards
- Markers
#### **Lesson Structure:**
**Introduction (10 minutes):**
1. **Greeting and Roll Call (2 minutes)**
- Welcome students and take attendance.
2. **Engaging Question (8 minutes)**
- Ask: "Why do we need clean water?"
- Discuss the importance of clean water for health and daily activities.
- Introduce the topic: Purifying water and Components of the CPU.
**Activity 1: Purifying Water (20 minutes):**
1. **Explanation (5 minutes)**
- Discuss what dirty water looks like and potential dangers of drinking unclean water (diarrhea, stomach aches, etc.).
- Outline simple purification methods:
- **Boiling:** Kills germs and bacteria.
- **Filtering:** Removes physical impurities.
2. **Demonstration (10 minutes)**
- **Boiling:** Show how to boil water (ensure safety and feasibility).
- **Filtering:** Demonstrate using a simple filter or clean cloth to remove visible debris.
3. **Discussion (5 minutes)**
- Ask students to share if they have seen or used any other methods for purifying water at home.
**Activity 2: Components of the CPU (20 minutes):**
1. **Explanation (10 minutes)**
- Define what a CPU is (Central Processing Unit) and its importance in a computer.
- Introduce main components:
- **ALU (Arithmetic Logic Unit):** Takes care of all arithmetic and logical operations.
- **CU (Control Unit):** Controls all the operations inside the computer.
- **Registers:** Small storage that quickly accesses data and instructions.
- Show a diagram chart or projector visual of CPU components.
2. **Interactive Activity (10 minutes)**
- **Matching Game:** Distribute sticky notes or cards with the names and functions of CPU components.
- Have students match the names to the correct functions on the board.
**Conclusion and Review (10 minutes):**
1. **Q&A (5 minutes)**
- Review key points by asking questions about water purification methods and CPU components.
- Example questions: "What does boiling do to water?", "What is the role of the ALU in a CPU?"
2. **Recap and Homework (5 minutes)**
- Summarize the lesson's key learnings.
- Assign simple homework: Draw and label a diagram of a CPU, and write a short paragraph about why clean water is important.
#### **Assessment:**
- **Informal assessment** through participation and answers during Q&A.
- **Homework assessment**: Check for correctness in the CPU diagram and clarity in the paragraph about clean water.
#### **Additional Notes:**
- Ensure active participation by encouraging students to share their ideas and experiences.
- Tailor the complexity of explanations to suit Primary 3 students' cognitive levels.
- Emphasize safety when discussing or demonstrating boiling water.