ENERGY Conversions.

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Presentation transcript:

ENERGY Conversions

Energy that is NOT being used Energy that IS being used There are two main kinds of energy… POTENTIAL ENERGY KINETIC ENERGY STORED energy or Energy that is NOT being used Energy in MOTION or Energy that IS being used Examples: Examples:

Elastic Potential Energy Elastic potential energy is associated with objects that can be stretched or compressed. Elastic potential energy can be stored in rubber bands, bungee chords, trampolines, springs, an arrow drawn into a bow, etc.

Gravitational Potential Energy Gravitational Energy is the energy of position or place. A rock resting at the top of a hill contains gravitational potential energy. Hydropower, such as water in a reservoir behind a dam, is an example of gravitational potential energy.

Law of Conservation Conserving Energy The law of conservation of energy states that when one form of energy is converted to another, no energy is destroyed in the process. Energy cannot be created or destroyed, so the total amount of energy is the same before and after any process. All energy is accounted for. Conserving Energy When you hear or read about conserving energy, don’t get confused with the law of conservation of energy. Conserving energy means saving energy, or not wasting it! In Science, energy is always conserved because its total quantity does not change. http://tonto.eia.doe.gov/kids/energy.cfm?page=about_home-basics

ENERGY CONVERSIONS (ENERGY TRANSFORMATIONS) Energy can be converted (transformed or changed) from one form to another. For example… 1) Food has POTENTIAL CHEMICAL energy. 2) When you eat it, the bonds in the atoms are broken and the energy is released to your cells. Your body CHANGES the chemical energy to KINETIC MECHANICAL ENERGY when you run, jump, write, walk. 4) Finally, your body creates THERMAL (HEAT) ENERGY you can feel because the molecules inside you are moving!

Think about the energy conversions taking place with a flashlight. Use the flow chart in your notes to show each form of energy that occurs. Light & Heat Batteries Wires CHEMICAL ENERGY ELECTRICAL ENERGY ELECTROMAGNETIC ENERGY

Label the ENERGY CONVERSIONS in your notes. ELECTRIC PENCIL SHARPENER GEARS & BLADES WIRES mechanical energy electrical energy

Where do we get electricity? Energy conversions from fossil fuel: electricity school house rock Where do we get electricity? Energy conversions from fossil fuel: http://www.youtube.com/watch?v=SeXG8K5_UvU

Electricity from hydropower http://www.youtube.com/watch?v=rnPEtwQtmGQ