Renewable Energy World (pembaharuan energi di dunia)

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.

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The total energy contained in an object is identified with its mass, and energy (like mass), cannot be created or destroyed. When matter (ordinary material particles) is changed into energy (such as energy of motion, or into radiation), the mass of the system does not change through the transformation process. However, there may be mechanistic limits as to how much of the matter in an object may be changed into other types of energy and thus into work, on other systems. Energy, like mass, is a scalar physical quantity. In the International System of Units (SI), energy is measured in joules, but in many fields other units, such as kilowatt-hours and kilocalories, are customary. All of these units translate to units of work, which is always defined in terms of forces and the distances that the forces act through.

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Renewable energy is energy which comes from natural resources such as sunlight, wind, rain, tides, and geothermal heat, which are renewable (naturally replenished).
There are some renewable energy :
1.Wind power
Airflows can be used to run wind turbines.
2.Hydropower
Energy in water can be harnessed and used. Since water is about 800 times denser than air,even a slow flowing stream of water, or moderate sea swell, can yield considerable amounts of energy.
3.Solar energy
Solar energy is the energy derived from the sun through the form of solar radiation.
4.Biomass
Biomass (plant material) is a renewable energy source because the energy it contains comes from the sun.
5.Biofuel
Liquid biofuel is usually either bioalcohol such as bioethanol or an oil such as biodiesel.
6.Geothermal energy
Geothermal energy is energy obtained by tapping the heat of the earth itself

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