ENERGY TRANSFORMATI

ONSChapter 5----Section 2

Changing Forms

Energy transforms continuously from one form to another

Observed by change in our environment

Tracking Transformations

How would you describe this form of energy?

The Law of Conservation of Energy

Remember energy cannot be created or destroyed!The only change occurring is the

form in which energy appearsEnergy moves from place to place

The original amount of energy is always the same (it is always accounted for)Is used to track the energy

changes in a system

Changing Kinetic and Potential Energy

Track the energy of throwing a ball in the air and catching it:

P = 5 JK = 5 J

P = 5 JK = 5 J

P = 0 JK = 10 J

P = 10 JK = 0 J

P = 0 JK = 10 J

Transforming Chemical Energy

Inside our bodies, chemical reactions take place that cause molecules to changeMuscles contract, part of the body moves

chemical kinetic energyFood – gives us energy when we digest the

molecules chemical thermal energy

Chemical energy breaks down when organisms dieBiomass = fuel from matter in living thingsFossil fuels

Transforming Electrical Energy

Electrical energy is used daily

Can be changed into:Sound energy via wavesKinetic energy (speaker vibration or

powered machines)Chemical (when sound reaches nerve

cells)Thermal (when a cord heats up)Light/Radiant (powering a light source)

Transforming Thermal Energy

Energy in the form of heat is almost always a product of an energy transformation Chemical Thermal

Something being burned Electrical Thermal

Electric chord heats up Thermal Kinetic

Water boils into steam to energize steam engines (the steam turns the turbine)

Thermal Radiant Heated metal glows

How Thermal Energy Moves

Always from something with a higher temperature to something with a lower temperatureEx. From a warm cup to the air

around it

Generating Electrical Energy

We use an enormous amount of electrical energy daily

POWER PLANTS: Usually the final 2 steps contain a:Turbine- is a set of narrowly spaced

fan blades that is turned by steam to power the generatorFossil fuels are burned to generate

the steamGenerator- a device that transforms

kinetic energy into electrical energy

Nuclear power plants operate similarly

Power Plant Energy Flow