1. Transfer of Energy

2. What does “Transfer of Energy” mean? How heat (energy) moves.

3. Heat moves from hot cold
Source
Sink
HIGH
TEMPERATURE
LOW
TEMPERATURE
FLOW of HEAT

4. Heat (energy) is transferred by _________, _________, or _________.
Heat will always flow from a ______ to a ____ until ________ is reached.
Heat (energy) is transferred by _________, _________, or _________.
source
sink
equilibrium
Sink
Source
conduction
convection
radiation

5. Methods of Heat Transfer
CONDUCTION - Direct transfer from atom to atom caused by molecules vibrating and colliding (touching).
*most effective in solids, especially metals*

6. Conduction Example
Warmer End
Cooler End

7. *Based on differing densities.*
2. Convection: Transfer of ____ by cyclic movement of fluid.
*Based on differing densities.*
Ex: liquid & gas.
heat

8. Convection Current Example
2. On reaching the surface the water ______ in contact with the air.
cools
3. As the water ______ it becomes _____ _______ and ________
1. As the water is ______ it becomes _________ and _______
cools
heated
more
less dense
dense
rises.
sinks.
4. A cycle develops, we call this a __________ ________ or cell.
convection
heat
current

10. 3. Radiation: Transfer of heat via electromagnetic waves
3. Radiation: Transfer of heat via electromagnetic waves. Can occur in solid, liquid, gas, and space.

11. Conduction
Radiation
Convection

12. Exercise #3 - Transfer of Energy
Label each of the pictures with the primary form of energy transfer that is taking place.
*Remember* Conduction, Convection, Radiation.
Please work quietly!

13. 1. Radiation!

14. 2. Convection!

15. 3. Conduction!

16. 4. Convection!

17. 5. Conduction!

18. 6. Radiation!

19. 7. Conduction!