Solar energy is nothing but the radiant heat and light of the sun. There are a number of techniques to harness this energy source. It is mainly used for the generation of electricity.

-NUCLEAR ENERGY

There are basically two ways of harnessing nuclear energy: 1.Nuclear fission and 2.Nuclear fusion Nuclear fission is currently being used for the production of electricity. The second type, i.e., Nuclear fusion can not be controlled and hence is not being used for the generation of electricity.

Hydroelectricity is the electricity generated by hydropower, i.e., the production of power through use of the gravitational force of falling or flowing water. It is the most widely used form of renewable energy. Once a hydroelectric complex is constructed, the project produces no direct waste, and has a considerably lower output level of the greenhouse gas carbon dioxide (CO2) than fossil fuel powered energy plants.

-WAVE OR TIDAL ENERGY

Wave energy or tidal energy is also a kind of hydropower that converts the energy of waves or tides into electricity and other energy forms. the energy of moving water helps to run the turbines and then energy is generated.

-WIND ENERGY

Wind energy is the direct conversion of the kinetic energy of the wind into other useful energy sources through turbines. Perhaps, this is the most widely used renewable source of energy.

-GEOTHERMAL ENERGY

Geothermal energy is the energy that is stored in the interior of the earth. This heat is then used for the generation of other energy source

-THERE ARE ALSO OTHER SOURCES OF ENERGY LIKE PHOTO  - ELECTRIC

The photon's energy transfers to the valance electron of an atom in the n-type Si layer. That energy allows the valance electron to escape its orbit leaving behind a hole. In the n-type silicon layer, the free electrons are called majority carriers whereas the holes are called minority carriers. As the term "carrier" implies, both are able to move throughout the silicon layer, and so are said to be mobile. Inversely, in the p-type Si layer, electrons are termed minority carriers and holes are termed majority carriers, and of course are also mobile.