Energy Conversions
Chapter 9
Section 2
Conversion vs. conservation
Every day usage is to save water or fuel by not using as much.
Science law usage- When we say energy is conserved we mean that it is not lost, all of the energy that goes into a chemical reaction or energy conversion can be accounted for. Not all of it can be used, ( heat, sound and random vibrations can be difficult to use) but it is all there. Energy is not gained or lost in a conversion.
What is Energy Conversions?
Energy Transformations
Please raise your hand.
Conversions Involving Chemical Energy
Chemical energy of food is converted into kinetic energy when you are active and thermal and thermal energy to maintain body temperature.
Conversions Involving Electrical Energy
Examples of Conversions Involving Electrical Energy
Describe an example in which electrical energy is converted into thermal energy.
Alarm clock | Electrical energy ➔ | Light energy and sound energy |
Battery | Chemical energy ➔ | Electrical energy |
Light bulb | Electrical energy ➔ | Light energy and thermal energy |
Blender | Electrical energy ➔ | Kinetic energy and sound energy |
Energy and Machines
Example:
and what type of energy does it
transfer?
Figure 19 (pg. 226)
machines that convert
Energy?
Some Machines that Convert Energy | |
Electric motor | Microphone |
Windmill | Toaster |
Doorbell | Dishwasher |
Gas heater | Lawn mower |
Telephone | clock |
Figure 21 (pg. 227)