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

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Presentation transcript:

Transfer of Energy

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

Heathotcold Heat moves from hot cold FLOW of HEAT HIGHTEMPERATURELOWTEMPERATURE SourceSink

Heat will always flow from a ______ to a ____ until ________ is reached. Heat (energy) is transferred by _________, _________, or _________. sourcesink equilibrium conductionconvection radiation Source Sink

Methods of Heat Transfer 1. CONDUCTION 1. CONDUCTION - Direct transfer from atom to atom caused by molecules vibrating and colliding (touching). most effective in solids, especially metals *most effective in solids, especially metals*

Conduction Example Warmer End Cooler End Let’s view a demo…

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

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

Let’s view a demo…

3. Radiation: Transfer of heat via electromagnetic waves. Can occur in solid, liquid, gas, and space. Let’s view a demo…

Conduction Convection Radiation

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!