3-1 Heat and temperature (3.1)

• Natuurkunde
• Middelbare school
• havo, vwo
• Leerjaar 2

Heating things up (3.1)

Discovering

(p 98)

make questions 1 up to 6

The big idea here is: how can you conduct a reliable experiment

You have 7 minutes

LESSON GOALS

- How does insulation work

- How do we heat up a house and a body

- How can we use geothermal energy

How do you keep warm?

Insulation

- People use a coat.

- Animals use their fur, 

   feathers or a layer of fat.

- We colse the door of a

   heated room.

Whales

- Layer of fat/ 'whale blubber'

- Tongue and fins are thinner,

   because there is less fat.

- Blood is cooled down

   when it goes to the tongue.

- The heat is passed to the cold blood returning back to the 

   body

Heating up a house

• Central heating can use natural gas or electricity.
  
• Sun heats up a house.
• A fireplace does the same.
  

Body

Food is the most important source of energy.

When you loose heat your body needs extra energy to stay at the right temperature.

Geothermal energy

The temperature of the earth centre is about 5 500 C

The outer layers of the earth act as insulation.

On average the temperature increases by 3 C for every 100 m. 

Iceland - uses geothermal energy as an energysource.

Which is NOT an energy source?

1. Food
2. Alcohol
3. Central heating system
4. Petrol

In a cold environment you use more food than in a warm environment.

1. True
2. False

Fuels are energy sources.

1. True
2. False

Double glazing lets more heat through than single glazing.

1. True
2. False

Heat is always needed to make electricity.

1. True
2. False

Questions

2-7

Rules: No discussion

When you are done- Look for more information online about the role of geothermal energy

Conclusion

• Insulation prevents heat loss
• Energy sources provide energy
• Energy sources are: the Sun, fuels such as natural gas, wood and petrol, and also food