Transfer of Energy.

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Presentation transcript:

Transfer of Energy

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

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

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

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

Conduction Example Warmer End Cooler End

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

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

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

Conduction Radiation Convection

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!

1. Radiation!

2. Convection!

3. Conduction!

4. Convection!

5. Conduction!

6. Radiation!

7. Conduction!