OUTCOME
By the end of the lesson you will be able to identify the causes, effects and treatment of electric shocks to humans in the context of household use of electricity
Electric shock disrupts the electrical impulses in the nervous system and can be fatal
Domestic electricity supply and appliances are designed to prevent dangerous accidents
LEARNING TASKS
Explore and explain
Why is electricity dangerous?
What happens (specifically) when you are electrocuted?
Watch this slo-mo video
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.
Elaborate and evaluate
Next lesson
Finish off all questions
Pre-reading and summaries
Try questions 10 - 15
Using the multimeters, compare the resistance of moist skin with dry skin
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.