Unit 4 Reassessment Review Energy Conversions Heat Travels Conduction, Convection, Radiation

Directions To start click “Slide Show” and “From Beginning” As you go through the PowerPoint, take DETAILED notes on – Energy Conversions Direction of Heat Ways Heat Travel

What is Energy Energy can be defined as the ability to do work. Work only occurs when something is using energy.

of Energy Before You Start, Review The Seven Forms Mechanical (kinetic & potential) Thermal (moving particles) Electrical ( electrically charges particles) Radiant (light, travels in waves through space) Nuclear (stored in nucleus of atom) Sound (vibrations through matter) Chemical (stored in the bonds of compounds)

All forms of energy can be converted into other forms. Energy Conversion Energy can be changed from one form to another. Changes in the form of energy are called energy conversions. All forms of energy can be converted into other forms.

Energy conversions The sun’s light energy goes through solar panels and can be converted directly into electricity.

Energy conversions Green plants convert the sun’s light energy (electromagnetic) into chemical energy (starches and sugars).

Other energy conversions In a battery, chemical energy is converted into electric energy. How a hydro electric dam works – Moving water has mechanical energy the is converted to electrical energy by a generator.

Energy Conversions In an automobile engine: 1. the chemical energy in fuel is burned to convert - 2. into heat energy. 3. The heat energy is then changed - into mechanical energy to move the car. (it also turns into sound energy right!?)

Chemical  Heat Mechanical

The Law of Conservation of Energy Energy can be neither created nor destroyed by ordinary means. It can only be converted from one form to another. If energy seems to disappear, then scientists look for it – leading to many important discoveries. WATCH THIS!!!

Vocabulary Words – stop. Test your self now Vocabulary Words – stop! Test your self now. If you can’t define & give examples go back and review again. energy mechanical energy heat energy chemical energy radiant energy electrical energy nuclear energy energy conversion Law of Conservation of Energy

Direction of Heat Transfer Heat always moves from a warmer place to a cooler place. Hot objects in a cooler room will cool to room temperature as they give off heat energy. Cold objects in a warmer room will heat up to room temperature as they gain heat energy.

Direction of Heat Transfer Heat always moves from hotter materials to the cooler materials. Your warm tea will give energy to the ice cubes until both the tea and the ice have reached the same temperature.

Heat travels in three ways, but how can we tell the difference?

Heat Transfers

EXAMPLE OF CONDUCTION A piece of cheese melts as heat is transferred from the meat to the cheese (Contact)

Examples of Convection: Have you ever noticed that the air near the ceiling is warmer than the air near the floor? Or that water in a pool is cooler at the deep end? Examples: air movement in a home, pot of heating water.

Examples of Radiation Fire Heat Lamps Sun

Click Here to learn a conduction convection radiation song… you’re going to love it 