Energy Is the ability to do work or cause change Energy is in everything.Energy is in everything. There are two types of energy:There are two types of energy: Stored (potential) energyStored (potential) energy Working (kinetic) energyWorking (kinetic) energy Energy exists in several different forms:Energy exists in several different forms: –Mechanical –Thermal –Chemical –Electrical –Light –Nuclear.

The Law of Conservation of Energy Energy Law I The Law of Conservation of Energy states that energy can not be created or destroyed; it only changes form.

Energy The ability to do work or cause change Heat (Thermal) Light (Radiant) Chemical Electrical Nuclear Mechanical Energy Bubble Map Convection Conduction Radiation

Radiant or Light Energy Radiant energy is solar and light energy that travels in electromagnetic waves. Our ultimate energy source is radiant energy from the sun. Our ultimate energy source is radiant energy from the sun.

What is Electrical Energy? o Energy caused by the movement of electrons. o Easily transported through power lines and converted into other forms of energy oElectrical energy is the movement of electrical charges.

What is Mechanical Energy? o Energy due to a object’s motion (kinetic) or position (potential). The bowling ball has mechanical energy. When the ball strikes the pins, mechanical energy is transferred to the pins!

Examples of Mechanical Energy

What type of energy is shown below? Thermal Energy

What is Thermal Energy? o Heat energy o The heat energy of an object determines how active its atoms are. hot rapid movement A hot object is one whose atoms and molecules are excited and show rapid movement. cooler less movement. A cooler object's molecules and atoms will show less movement.

What is Chemical Energy? chemical reactions o Energy that is available for release from chemical reactions. The chemical bonds in a matchstick store energy that is transformed into thermal energy when the match is struck.

What type of energy is shown below? Chemical Energy (yummy)

Chemical Energy Plants can make their own energy through a process called photosynthesis. They are the bases for a food chain. All other living things that cannot carry on photosynthesis depend on plants for their energy.

Energy Transformation In photosynthesis radiant or light energy from the sun is changed to chemical energy in the leaf.In photosynthesis radiant or light energy from the sun is changed to chemical energy in the leaf.

QUIZ TIME! Electrical energy is transported to your house through power lines. When you plug an electric fan to a power outlet, electrical energy is transformed (or changed) into what type of energy? HINT: Motion MECHANICAL ENERGY

What type of energy is shown below? Chemical Energy

Energy is Transformed! Battery – Chemical potential energy ----Electrical (kinetic) energy Food – Chemical potential energy Motion (kinetic) energy

All food has chemical energy. Consumers eat and their bodies transform the chemical energy into thermal and mechanical (motion) energy. Energy Transformations chemical mechanical The same energy transformations take place when we put gasoline in cars. An energy transformation is a change from one form of energy to another form of energy.

The toaster is powered with electricity. The toaster transforms or changes the electricity into heat and light. electrical thermal The boy is applying a force by pulling back the slingshot. When he releases it, whatever he has in the slingshot will fly. Is the picture an example of POTENTIAL or KINECTIC energy? mechanica l

Energy Transformations MechanicalElectrical Falling water Blades of the turbine turning Generator

Next look at the flow map showing the flow of energy transformations in a car from starting vehicle to driving. You should see many types of energy.

Energy Transfer Chemical Electrical Sound (mechanical) Light (Electromagnetic) Thermal Mechanical