Energy exists in many forms such as mechanical, chemical, electrical, thermal, light, and nuclear. Mechanical energy can be kinetic, involving movement, or potential. Chemical energy is stored in substances while electrical and thermal energy involve electricity and heat respectively. Energy can be transformed from one type to another but is never destroyed. Energy sources can also be renewable, coming from natural resources like hydroelectric, wind, solar or biofuels, or non-renewable which comes from limited resources like petroleum, coal, natural gas or uranium.

1. Unit 4 Energy

2. Energy is the hability of an object to
move, heat up or produce light.

5. Energy appears in many forms:
• Mechanical:
• Energy that produces movement and
change directions.

7. There are two types of mechanical
energy
• Kinetic energy: Is the energy in the form of
movement.
• Potential energy: this is the energy in the
form of potential movement.

11. Chemical energy
• This is stored in some substances.

13. Electrical energy
• This is the energy in the form of electricity.

15. Thermal energy
• This is energy in the form of heat.

16. Light energy
• This is the energy in the form of light

18. Nuclear energy.
• This type of energy is stored in the atomic
structure of all matter.

20. Energy.
• Energy never dissapears.

22. It can be transformed from one type
to another

23. examples

24. We can classify energy into two
groups.
• Renewable
• Non renewable

26. Renewable energy
• We get energy from natural resources.

27. Renewable energy sources:
• Hydroelectric e.
• Wind e.
• Solar e.
• Biofuels e.

28. Non-renewable energy
• Non- renewable energy is energy from
resources that are limited.

30. Non renewable energy resources
• Petroleum
• Coal
• Natural gas
• Uranium.

32. What are the three Rs?
• Reduce
• Reuse
• Recycle.