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Energy

Energy exists in many forms.

Energy can be moved from one

object to another.

Energy can be changed from

one form to another.

Energy cannot be created ordestroyed.

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What is Always Present

But Never Visible?

Although energy isnt visible,

you can detect evidence of energy.

ENERGY

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Law of Conservation of Energy

With every transformation, some energy is

converted to less useful forms. Energy

conversions are not 100% efficient. The

energy output for the intended purpose is

seldom the same as the energy we put in.

100 J electricity in95 J heat out

5 J light out

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Potential Energy

The energy in matter due to its position or

the arrangement of its parts

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Kinetic Energy

Energy of a moving object

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Six Forms of Energy

Mechanical Chemical Electrical

Heat/ThermalLight/Radiant

Nuclear

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Mechanical Energy

Energy that movesobjects from place toplace

You use mechanicalenergy when you kick aball or turn the pedalsof a bicycle

Other examples includewater flowing in astream, tires rollingdown a road and soundwaves from our iPod.

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Chemical Energy

Energy released by achemical reaction

The food you eatcontains chemical

energy that is releasedwhen you digest yourmeal

Wood, coal, gasoline,and natural gas arefuels that containchemical energy

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Electrical Energy

Energy that comes fromthe electrons within atoms

It can be generated at a

power plant or inside abattery and can powereverything from remote-controlled cars torefrigerators

Lightning and staticelectricity are also forms of

electrical energy

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Heat (Thermal) Energy

Energy created bythe motion ofatoms and

molecules thatoccurs within anobject

Thermal energyexists when youheat a pot of wateron a stove

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Nuclear Energy

Energy contained in the

nucleus of an atom

Nuclear energy is releasedwhen nuclei are split apart

into several pieces, or

when they are combined to

form a single, larger

nucleus

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Light (Radiant) Energy

Energy that can movethrough empty space

The sun and stars are

powerful sources ofradiant energy

The light given off by light

bulbs and campfires arealso forms of radiantenergy

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Energy Conversion

All forms of energy can be converted intoother forms of energy

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Energy Forms

These forms of energy do work that end

up as motion, light, or heat.

Energy is used to power manufacturing,

light buildings, propel vehicles, and

communicate messages.

What else do we use energy for?

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Image Resources

Microsoft, Inc. (2009). Clip Art. Retrieved March 24, 2009, from

http://office.microsoft.com/en-us/clipart/default.aspx

ETH Renewable Energy Carriers (2010). Professorship of RenewableEnergy Carriers. Retrieved May 5, 2010, from

http://www.pre.ethz.ch/research/projects/?id=solarfuels

http://office.microsoft.com/en-us/clipart/default.aspxhttp://www.pre.ethz.ch/research/projects/?id=solarfuelshttp://www.pre.ethz.ch/research/projects/?id=solarfuelshttp://office.microsoft.com/en-us/clipart/default.aspxhttp://office.microsoft.com/en-us/clipart/default.aspxhttp://office.microsoft.com/en-us/clipart/default.aspx