ENERGY SOURCES

WHAT ARE ENERGY SOURCES?
They are natural resources that we can use to generate different forms of energy. Then we can transform that energy for various purposes.

There are two types of energy sources: renewable and non-renewable.

NON-RENEWABLE ENERGY SOURCES
They come from natural resources that are limited. It would take millions of years to generate these sources of energy. The most commonly are fossil fuels (oil,coal and natural gas) and nuclear energy (radioactive materials)

RENEWABLE ENERGY SOURCES
They comme from natural resources that we can´t set up completly. These include hydroelectric, solar, marine, geothermal, and biomass.

ENERGY TRANSFORMATIONS
There are various types of energy transformations. We can transform chemical energy into other types of energy: 
1.Luminous energy  3.Sound energy
2.Thermal energy    4.Mechanical energy

We can transform electrical energy into:
1.Kinetic energy
2.Heat

We can transform nuclear energy into:
1.Luminous energy
2.Thermal energy

We can transform luminous energy into electrical energy.

ENERGY

WHAT IS ENERGY?
Energy is the capacity of a body to perform transformations and do works. It is measured in joules (J) and if it takes the form of heat, is measured in calories (cal).

FORMS OF ENERGY
There are many types of energy:
Potential- Energy that is stored and waiting to be used later.
Kinectic-The enrgy of physical movement
Mechanical-The sum of kinetic and potential energy
Sound-The energy of sound waves, wich are produced by vibrations.
Electrical-The product of an electrical current
Nuclear-The energy in the nucleus of an atom
Luminous-Associated with light 
Calorific-Associated with the movement of particles in matter
Chemical-Results from the formation or decomposition of substances.
Electromagnetic-Occurs when electrical currents create magnetic fields.

POWER
The power of a machine is the quantity of work that it can do in a certain amount of time. The I.S unit for power is the watt (W).