Transforming and Converting Energy Energy Transformation When energy

Transforming and Converting Energy

Energy Transformation When energy is changed from one form of energy to another Use them in our daily lives Examples: When you toast bread, the toaster transforms (changes) electrical energy into heat energy Electrical energy from a doorbell becomes sound energy Chemical energy from a battery in a flashlight becomes light energy

Not Lost, Transformed Can change into different forms but it can never be lost or destroyed Car burns gas, the chemical energy of the gas transforms into heat energy and then into mechanical energy when the car moves Heat energy is not helpful in making the car move, but none of the energy is lost or destroyed It just changes into other forms

Activity We have learned about many forms of energy: heat, light, sound, electrical, mechanical and chemical What are some examples of each form?

Activity What form of energy is needed to make the LCD projector work? Input- form of energy used to make an object/thing work (e. g. , projector) Output: form(s) of energy observed (that we see) What forms of energy can you see when the projector is plugged into an electrical outlet and turned on?

Activity The energy in the projector is stored and transformed in the following way: Electricity is transferred from the outlet to the projector This energy is then changed into light energy The light energy is the output If you place your hand near the bulb of the projector you can feel the heat energy Changing Energy Device LCD Projector Input electrical energy Output Light and heat energy

Energy Transformation We have viewed how energy can be transformed from one form to another Other Examples: Radio using batteries: Chemical energy from battery is changed into electrical charge which is changed to sound energy Electric fan: electrical energy is changed to mechanical energy to make the fan turn/move Humans: chemical energy from food is changed to muscular energy Use the following examples and add them to the chart from the previous slide Device Input Output radio Electric fan humans

“Lost” Energy that apparently is “lost” is actually transformed as the examples we did in class showed us The “lost” energy from a system (e. g. , fan, LCD project) is actually transformed into one or more other energy forms that are not usefully to the system Example: heat from projector’s bulb doesn’t make it any brighter or help us see better

Your Turn Look around our class for devices or think about devices you use at home Identify how these devices change energy from one form into another form Use the chart we used in class today Some ideas are: car, lamp, doorbell, computer, hairdryer, lawn mower, remote control car, etc.