1. Energy: ● By Issam Amazdouy & Jaber Naimi.

2. Definition: In physics, energy is a quantity that is often understood as the ability a physical system has to do work on other physical systems. Since work is defined as a force acting through a distance (a length of space), energy is always equivalent to the ability to exert pulls or pushes against the basic forces of nature, along a path of a certain length.

3. Energy Forms: Energy can manifest itself in different ways: in the form of motion (kinetic) of position (potential), heat, electricity, electromagnetic radiation, etc.. Depending on the process, the Energy is called: ● Thermal Energy ● Power Energy ● Radiant Energy ● Chemical energy ● Nuclear energy

4. Energy Sources: Sources of energy are the resources in the nature of mankind can obtain usable energy in its activities. The origin of almost all sources of energy is the Sun that "recharge energy stores. " Energy sources are classified into two groups: renewable and non renewable resources as may be “unlimited”or “limited”.

5. 1).RENEWABLE ENERGY SOURCES: The renewable energy sources are those which, after use, can be regenerated naturally or artificially. Some of these renewable sources are subject to cycles that remain more or less constant in nature. There are several renewable energy sources, including: ● Tidal (tidal) ● Water power (dams) ● Wind energy (wind) ● Solar (Sun) ● Energy from biomass (vegetation)

6. 2).NON-RENEWABLE ENERGY SOURCES: The non-renewable energy sources are those found in a limited way on the planet and whose consumption rate is greater than its regeneration. There are several renewable energy sources, including: ● Fossil fuels (coal, oil and natural gas) ● Nuclear power (fission and nuclear fusion)

7. The End: Remeber, we all can safe this planet, so please, use Renewable Energy.