1. Testing Solar Cookers

2. What do commercial solar cookers look like? Black container that holds food All angled sides lined with aluminum foil Clear plastic over container

3. Let’s put them to the test!

4. Testing the cookers 10 am – 12 pm 12 pm – 2 pm2 pm – 4 pm 50 mL water 45 mL water

5. Testing the cookers 10 am – 12 pm 12 pm – 2 pm2 pm – 4 pm 50 mL water 45 mL water What is the problem the family is investigating?

6. Testing the cookers 10 am – 12 pm 12 pm – 2 pm2 pm – 4 pm 50 mL water 45 mL water What is the problem the family is investigating? What time of day is solar energy the strongest ?

7. Testing the cookers 10 am – 12 pm 12 pm – 2 pm2 pm – 4 pm 50 mL water 45 mL water What is the independent variable in this investigation?

8. Testing the cookers 10 am – 12 pm 12 pm – 2 pm2 pm – 4 pm 50 mL water 45 mL water What is the independent variable in this investigation? Time of day

9. Testing the cookers 10 am – 12 pm 12 pm – 2 pm2 pm – 4 pm 50 mL water 45 mL water How can we make this a more controlled experiment?

10. Testing the cookers 10 am – 12 pm 12 pm – 2 pm2 pm – 4 pm 50 mL water 45 mL water How can we make this a more controlled experiment? The amount of water in each beaker should be the same.

11. Testing the cookers 10 am – 12 pm 12 pm – 2 pm2 pm – 4 pm 50 mL water 45 mL water What must we do before we begin the experiment?

12. Testing the cookers 10 am – 12 pm 12 pm – 2 pm2 pm – 4 pm 50 mL water 45 mL water What must we do before we begin the experiment? Measure the temperature of the water in the beaker.

13. Testing the cookers 10 am – 12 pm 12 pm – 2 pm2 pm – 4 pm 50 mL water 45 mL water What is the dependent variable in this experiment?

14. Testing the cookers 10 am – 12 pm 12 pm – 2 pm2 pm – 4 pm 50 mL water 45 mL water What is the dependent variable in this experiment? The change in temperature of the water.

15. What is the purpose of the aluminum foil? Black container that holds food All angled sides lined with aluminum foil Clear plastic over container

16. What is the purpose of the aluminum foil? To reflect the light onto the cooking area. Black container that holds food All angled sides lined with aluminum foil Clear plastic over container

17. What is the purpose of the clear plastic cover over the container? Black container that holds food All angled sides lined with aluminum foil Clear plastic over container

18. What is the purpose of the clear plastic cover over the container? To block the warmed air in the container from escaping. Black container that holds food All angled sides lined with aluminum foil Clear plastic over container