2.A] What is solar energy? Apply the Solar energy conversion technic into electrical
energy in a solar cell
Answer:
Solar Energy: Solar energy is the energy obtained by capturing heat and light from the Sun. Energy from the Sun is referred to as solar energy. Technology has provided a number of ways to utilize this abundant resource. It is considered a green technology because it does not emit greenhouse gases.Solar energy is abundantly available and has been utilized since long both as electricity and as a source of heat.
There are several ways the solar energy can be harnessed. Such as;
- a)Solar Photovoltaic Conversion
- b)Solar Thermal Conversion
For, electricity generation Solar P-V cells are used at a larger extent.
Solar Power Plant: The major components of the Solar power are plants are: Solar Panels, Solar cells, Battery and Invertor.
As sunlight falls over a solar cell, a large number of photons strike the p-type region of silicon. Electron and hole pair will get separated after absorbing the energy of photon. The electron travels from p-type region to n-type region due to the action of electric field at p-n junction. Further the diode is reversed biased to increase this electric field. So, these current starts flowing in the circuit for individual solar cell and combining the current of all the solar cells of a solar panel, to get a significant output.
Solar power plant has a large number of solar panels connected to each other to get a large voltage output. The electrical energy coming from the combined effort of solar panels is stored in the Lithium-ion batteries to be supplied at night time, when there is no sunlight.