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As it is known that the sun is an unlimited source of energy, in today's world the solar energy has a different application on the basis of its conversion and usage. The major focus of this paper is on how to convert the solar energy i.e. the methods through which it can be implemented and employed. There arises a standard question which is "why solar energy?" and the answer to this is mentioned earlier that it is an unlimited source of energy. So during the daytime, an ample amount of energy could be stored and can be converted into electrical or thermal energy through the exploitation of the methods discussed below. This paper also sheds a light on the current scenario of the utilization and the need for solar energy in India. Furthermore, the paper also focuses on the various applications of it in the day to day life and their advantages. A small reflection on the topic Space-Based Solar Power [SBSP] has been put down in which it is discussed how the solar energy can be converted and utilized in space with its advantages and a relative comparison on how it is better as compared to the same conversion done on earth and also some of its disadvantages mentioning why is it not currently possible.

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As the law of conservation of Energy states that energy can neither be created nor be destroyed, it can only be converted or transformed from one form to another, moreover there are various sources of energy like solar, wind, geothermal etc. The purpose of this paper is to put light on radio frequency based energy harvesting systems. The said RF energy is currently transmitted from various sources/transmitters which include mobile base stations, mobile, telephone, TV/radio broadcast stations and handheld radios. The propensity to gather or harvest RF energy from the committed sources empowers or authorizes wireless charging for low power appliances or devices which furthermore results in better product design dependableness and utilization. The battery operating systems can be charged gradually and slowly to abolish battery replacements or to extend battery durability disposable batteries can be used. The battery free systems i.e. RF energy based devices can be designed to work upon availability i.e. when the sufficient charge is accumulated. In all the cases mentioned above the devices or the appliances can be operated without the usage of cables battery panels connectors which can make these devices more mobile and portable while operation and charging as well. All this and more can be achieved by RF based energy harvesting and main cause or reason to harvest RF based energy is that it is consequentially FREE energy. The sources of RF energy are increasing day by day like mobile based transmitters from which more and more energy can be harvested. This paper more importantly focuses on parameters to design the system, methods, different frequency ranges that can be utilized and the respective circuitry for converting Low voltage output to High voltage for various applications using RF based energy harvesting.