unit 6 lesson 1 energy conversion and conservation copyright © houghton mifflin harcourt publishing...

Unit 6 Lesson 1 Energy Conversion and Conservation

Copyright © Houghton Mifflin Harcourt Publishing Company


Florida Benchmarks


• SC.7.P.11.2 Investigate and describe the transformation of energy from one form to another.

• SC.7.P.11.3 Cite evidence to explain that energy cannot be created nor destroyed, only changed from one form to another.


Florida Benchmarks


• MA.6.A.3.6 Construct and analyze tables, graphs, and equations to describe linear functions and other simple relations using both common language and algebraic notation.

• LA.7.4.2.2 The student will record information (e.g., observations, notes, lists, charts, legends) related to a topic, including visual aids to organize and record information, as appropriate, and attribute sources of information.

Perfect Form


What are some forms of energy?

• Energy can come in many forms.

• Mechanical energy is the sum of an object’s kinetic energy and potential energy.

• Sound energy results from the vibration of particles. This is why sound cannot travel through empty space.



• Electromagnetic energy is transmitted in the form of electromagnetic waves.

• Electromagnetic waves are produced by the vibration of electrically charged particles.

• Electromagnetic waves can travel through empty space.




• Chemical energy is the energy stored in chemical bonds that hold chemical compounds together.

• Thermal energy is the energy an object has due to the motion of its molecules.

• The faster the molecules move, the more thermal energy the object has.

• Heat is the transfer of thermal energy.




• Nuclear energy comes from the nucleus of an atom.

• When an atom’s nucleus breaks apart, or when the nuclei of two atoms join together, energy is released.



Transformers


What is an energy transformation?

• An energy transformation takes place when energy changes from one form into another form.

• Any form of energy can change into any other form of energy.

• Often one form of energy can change into two or more other forms.


What is an energy transformation?

• In a flashlight, chemical energy is transformed into electrical energy.

• The electrical energy is then transformed into light and thermal energy.



Is energy conserved?

• A group of objects that transfers energy only to one another is called a closed system.

• In a closed system, all the energy is conserved.

• The law of conservation of energy states that energy cannot be created or destroyed. It can only change forms.



Efficiency Expert!


How is efficiency measured?

• When energy is transformed from one form to another form, not all of it is turned into useful energy.

• Usually, some energy is also transformed into thermal energy.

• Efficiency is the ratio of useful output energy to input energy.


How is efficiency measured?

• Energy efficiency is highly desirable because it means as much energy as possible is converted to useful forms.

• Efficiency is calculated by dividing energy out by energy in and then multiplying by 100 percent.

• If less energy is wasted, then less energy is needed to operate a machine.



unit 6 lesson 1 energy conversion and conservation copyright © houghton mifflin harcourt publishing...

Documents

energy conversion

form of energy

forms of energy

transformation of energy

energy transformation

chemical energy

electromagnetic energy

electrical energy