1. Energy

2. DEFINITION
Energy is the ability to do work

3. Forms of energy
Energy is found in different forms, such as light, heat, sound and motion. There are many forms of energy, but they can all be put into two categories:
Kinetic
Potential

4. Kinetic energy (working energy)
Kinetic energy is motion like waves, electrons, atoms and molecules.
Examples of kinetic energy are:
Electrical energy
Motion energy like wind
Sound energy
Radiant energy like light and solar
Thermal energy

5. Potential energy (stored energy)
Potential energy is stored energy and the energy of position like gravitational
Examples of potential energy are:
Chemical energy- biomass, petroleum, natural gas, the chemical in the battery.
Stored mechanical energy like compressed springs and stretched rubber bands.
Gravitational energy- hydropower such as water in a reservoir behind a dam.

6. Energy can not be created or destroyed
Energy can not be created or destroyed. When we use energy, it does not disappear; we change it from one form to another. For example a car engine burns gasoline converting the chemical energy in gasoline into mechanical energy.

7. Examples of changing forms of eneregy

9. Energy sources are classified into two groups: Renewable Nonrenewable
Sources of energy
Energy sources are classified into two groups:
Renewable
Nonrenewable

10. Renewable Energy sources
Renewable energy sources supplies are replenishable.
Examples of renewable energy sources
Solar energy
Hydropower

12. Nonrenewable energy sources
Nonrenewable energy sources are supplies that are limited.
Examples of nonrenewable energy sources are:
Fossil Fuels like oil, natural gas and coal are formed from heat and pressure from rock and soil on fossils (dead animals and plants) over millions of years
Uranium