OUTCOME
By the end of the lesson you will be able to describe and explain fuses, safety switches, Earthing and insulation techniques used to ensure household safety when using electricity.
Domestic electricity supply and appliances are designed to prevent dangerous accidents
LEARNING TASKS
Explore and explain
Watch this screencast about how a thermal circuit breaker works
Look at this diagram of the toaster. Can you find the safety hazard? Describe what the hazard is and under what circumstances it would be dangerous.
Elaborate
Create a table which compares and contrasts the following safety devices: Fuse, Thermal Circuit breaker, Residual Current Device, Earth Wire, Double Insulation. Your table should focus on how they work, strengths and weaknesses.
Evaluate
Answer questions from text: 16, 17
Prepare for GA