1. E N E R G Y

2. Energy is all around you!
You can hear energy as sound.
You can see energy in the light.
And you can feel it as wind.
Energy can be defined as the ability to do work.
Because of the direct connection between energy and work, energy is measured in the same unit as work: joules (J).

3. Forms of Energy Chemical Electrical Sound Radiant / Light Mechanical
Thermal/Heat
Nuclear

4. Light Energy:
Electrical Energy

5. Chemical Energy: stored in fuels & food
Sound Energy

6. Mechanical Energy: an object in motion
Thermal /Heat Energy
Mechanical Energy: an object in motion

7. Nuclear Energy The sun’s energy is produced from a nuclear fusion
Nuclear energy is the energy stored in the nucleus of an atom.
Nuclear energy is unusual in that it can give off energy in the form of light or heat, but it is the change in the atom's makeup that produces the energy.
The sun and power plants use nuclear energy.
The sun’s energy is produced from a nuclear fusion

8. Is it possible to get mechanical energy from heat energy?

9. Energy can be changed from one form to another.
Energy Conversions
Energy can be changed from one form to another.
At times we have a form of energy but it is not the one convenient for use. Therefore, we must convert it to another form. For example,
Chemical heat

10. ACTIVITY Can you figure out the energy input and output in the following energy conversions?

11. Electrical mechanical
Chemical heat + light

12. Energy changes in the production of electricity
Mechanical energy in water
Mechanical energy of turbine
useful electrical energy + sound

13. The Law of Conservation of Energy
Energy is neither created nor destroyed but only converted from one form to another.
The total amount of energy in the universe is constant.
Energy input = Useful energy output + wasted energy

14. ASSESSMENT
SUMMARY