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Q. What is renewable energy.
A. This energy is generated from the natural resources .The renewable energy is generally sun, wind, rain, tides, geothermal, biomass .
Working of solar cell- The working principle of a solar cell same as principle of P-N junction silicon diode .The cell consists of a semiconductor device of P-N junction. Silicon is used for solar cell material. Here are generally two junctions of P-N .One is high concentration of holes known as P- type and another is high concentration of electron known as N- type material. Sun light consists of plenty of photons .When the sun light falls on the P-N junction, due to excess of electron in N- type it try to diffuse with holes of P-type where as excess holes from P-type try to diffuse with electron of N-type. Due to exchange of electron and holes across the junction current flows through the junction .The dc EMF are generated with P-terminal is known as positive and N-terminal is known as negative. The EMF generated is depending upon the intensity of sun light. No of cells are connect in series to form a string and several strings are connect in parallel to form a module and several modules are connect in parallel to collect final electricity. The power generation depend on the number of cells connect.
The website www.mnre.gov.in give complete details of update news of renewable energy .