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Transfer of Thermal (heat) Energy

Transfer of Thermal (heat) Energy. Make a guess for each Conduction Convection Radiation. Conduction. Conduction is the transfer of energy through matter from particle to particle. Conduction involves making contact from hot item to cool item.

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Transfer of Thermal (heat) Energy

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  1. Transfer of Thermal (heat) Energy Make a guess for each • Conduction • Convection • Radiation

  2. Conduction • Conduction is the transfer of energy through matter from particle to particle. • Conduction involves making contact from hot item to cool item. • Metals “feeling cold” are just conducting heat away from our hands • What does conduction look like in the kitchen? • Boiling water on the stove: the water is making contact with the hot stove

  3. Convection • Convection is the transfer of heat by the actual movement of the warmed matter • A heater blowing air is moving the warm matter • What does this look like in the kitchen? • Inside the oven, the warm air is moving around. That’s why you keep the door closed. • Would a cookie “bake” if you put it on the stove? • No, the bottom would just burn.

  4. Radiation • Electromagnetic waves that directly transport ENERGY through space. • There is no contact or movement. • The source of energy can be far away • What does this look like in the kitchen? • Take a pot off the stove and hold your hand over the element. Can you feel the waves of heat warming your hand?!

  5. Energy • Defined as the ability to do work. • Energy is measured in joules (J). • Work done on an object gives energy to that object.

  6. 7 Forms of Energy

  7. Electrical Energy • Electrons • energy from electricity • Example: your TV

  8. Sound Energy • Vibrating molecules picked up by our ears.

  9. Chemical Energy • energy released from chemical reactions • Example: batteries, digesting food

  10. Heat Energy • How “fast” molecules are vibrating or moving

  11. Light Energy • Energy transmitted in electromagnetic waves that you can often see • Examples include radio, TV waves and colors represents different amounts of electromagnetic energy.

  12. Atomic Energy • Energy from splitting or combining atomic particles • i.e. nuclear power, sun, radioactive elements

  13. Mechanical Energy • Matter that is in motion OR • Energy from movement

  14. Einstein Seldom Cleans His Large Atomic Machine.

  15. Energy Conversions • All forms of energy can be converted to other forms.

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