| Lesson Plan |
| Grade: |
Date: 25/02/2026 |
| Subject: Physics |
| Lesson Topic: State that a fuse without an earth wire protects the circuit and the cabling for a double‑insulated appliance |
Learning Objective/s:
- Describe the construction and safety classification of double‑insulated (Class II) appliances.
- Explain how a fuse operates to protect a circuit when current exceeds its rating.
- Analyse why an earth wire is unnecessary for double‑insulated appliances yet a fuse is still required.
- Apply the concept by predicting the outcome of a fault in a double‑insulated appliance with and without a fuse.
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Materials Needed:
- Projector or interactive whiteboard
- PowerPoint slides or digital diagram of a double‑insulated appliance with fuse
- Sample plug‑fused appliance (e.g., hair dryer) or image
- Worksheet with fault‑scenario questions
- Multimeter (optional for demonstration)
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Introduction:
Begin with a quick demonstration showing a hair‑dryer plug that contains a fuse.
Ask students what would happen if the appliance failed and there was no earth connection.
Link this to their prior learning about insulation and circuit protection.
State that by the end of the lesson they will be able to state how a fuse safeguards the circuit and cabling of a double‑insulated appliance.
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Lesson Structure:
- Do‑now (5'): Students answer a quick question on why some appliances don’t need an earth wire.
- Mini‑lecture (10'): Explain double‑insulated construction and Class II classification using slides.
- Demonstration (8'): Show a fused plug, discuss fuse operation, and simulate a fault with a multimeter.
- Guided practice (12'): Worksheet activity where groups analyse fault scenarios and decide what the fuse does.
- Check for understanding (5'): Whole‑class Q&A using the three questions from the source.
- Summary & exit ticket (5'): Students write one sentence answering the key statement to remember.
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Conclusion:
Recap that a fuse, even without an earth wire, interrupts over‑current and protects both the circuit and the cabling of a double‑insulated appliance.
Collect the exit‑ticket sentences as evidence of learning.
Assign a short homework: research another Class II device and describe how its fuse protects it.
End with a reminder of safety when handling electrical equipment.
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