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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 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. • 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
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.
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?!
Energy • Defined as the ability to do work. • Energy is measured in joules (J). • Work done on an object gives energy to that object.
Electrical Energy • Electrons • energy from electricity • Example: your TV
Sound Energy • Vibrating molecules picked up by our ears.
Chemical Energy • energy released from chemical reactions • Example: batteries, digesting food
Heat Energy • How “fast” molecules are vibrating or moving
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.
Atomic Energy • Energy from splitting or combining atomic particles • i.e. nuclear power, sun, radioactive elements
Mechanical Energy • Matter that is in motion OR • Energy from movement
Energy Conversions • All forms of energy can be converted to other forms.