1. Heat Technologies in Everyday Life
Lesson Objective: Give examples of personal choices and society’s choices about using heat- related technologies.

2. Anybody have any of these at home?
No needed/Not working electrical devices such as hair dryers, toasters, flashlights, curling irons, etc. that your family wouldn’t mind donating for us to take apart?!

3. It is important also to control that heat.
In addition to being able to produce heat to meet human needs and wants…
It is important also to control that heat.

4. Imagine what would happen…
If your furnace came on at random times instead of when you needed heat.

5. What would happen…
If you couldn’t keep the temperature of your oven stable?

6. What if the temperature…
Of your clothes dryer was so high that it started a fire?

7. As technologies have developed to generate heat…
People have also invented ways to direct and manage that heat.

8. Personal and Societal Choices
Making effective choices begins with separating what you need from what you want. This is true whether you are making a decision as an individual, or as a group or society.

9. Needs vs Wants…
You NEED food to live, but you WANT to have pizza with your friends.
You NEED clothes in our cold climate, but you WANT $$ name brand items.

10. Check & Reflect- Together
For each technology, explain why you think it is a “need” or a “want”. If the technology is a want, what could be used if it were not available?
Hand-held hair dryer
Air-conditioning
Household furnace
Polar fleece clothing

11. North Americans have a fairly high standard of living.
This is a measure of how well we live, including the level of technology that we use in daily life.
(Some scientists believe the measure for standard of living should include such things as the divorce rate in a country, not just dollar amounts.)

12. North Americans have a fairly high standard of living.
Because we have a high standard of living, there are many tools that we have come to believe are necessary for living- like microwaves, for example.

13. Microwave ovens make cooking easier and faster…
But we could survive without them, and many people do.
They are a WANT, not a NEED.

14. Check and Reflect- Together
Explain what is meant by standard of living.
How has most people’s standard of living changed over time? Use examples related to heat in your answer.

15. Making sustainable choices
Sustainable means that something can be maintained or continued into the future.

16. When we talk about sustainable use of resources, we mean that we are trying to use our resources wisely and do as little damage as possible to the environment when we use them.
Both the personal and societal choices we make in using heat energy are important.

17. Some our our sources of heat energy may run out in the future, and they pollute the environment (coal, for example).
Others, like the sun, are not predicted to fun out for millions of years.

18. The sun’s energy, however, cannot completely replace the fuels we currently use for heat energy. A variety of sources of heat energy will be needed in the future.

19. New Heating/Cooling Technology…

20. Wristify thermoelectric bracelet makes heating and cooling personal
Developed by four MIT engineering students, the Wristify works on the principle that heating or cooling the skin on one part of the body can make the entire body feel warmer or colder..

21. Wristify thermoelectric bracelet makes heating and cooling personal
By creating a personal heating and cooling device, the Wristify team ultimately hopes to cut the amount of energy currently used to heat or cool entire buildings.

22. Careers & Profiles Read about a Winter Sportswear Designer, page 188.
Assess Your Learning, page 189, #s 1-5