Pv system 2 Coursework Example | Topics and Well Written Essays - 500 words

Pv system 2 - Coursework Example Semi conductors are used in photovoltaic cells to provide voltage as a result of light. The semiconductor absorbs the light thereby knocking electrons and letting them flow freely. This is a typical conversion of light to electricity at atomic level. The suns power originates from the fusion of Hydrogen. The proton-proton reaction produces deuterons, which is the nucleus of an isotope of Hydrogen 2 that contains one neutron and one proton as a result of the ejection of the positron and an uncharged neutron form the deuteron forms the nucleus of a deuterium which is a heavy Hydrogen (Hedegus and Luque 79). Deuteron and proton combines to form triton or Helium 3 which is an isotope of Helium. Helium 4 can also be formed through the combination of two Helium 3 to form two protons and Helium 4 or a combination of triton and deuteron that produces energy, neutron and Helium 4. The total energy yielded is 26.7MeV. This may be obtained through calculations based on the atomic mass energy of Helium 4 nucleus (Hedegus and Luque 79) Part of the radiation is lost to the outer space through radiation as some is scattered by the atmospheric gases. Some of the heat that reaches the earth’s surface has an average intensity termed as solar isolation and ranges between 0.6to 1.0kW/m2. This is mostly absorbed by plants as humans also harness the solar energy to produce electricity (Hedegus and Luque 48). In the production of electricity, the solar radiations are concentrated by PV cells into a silicon wafer. This is usually done through optical systems concentration may also be done through luminescence (Gratzel 6848). Solar thermal power is an option of generating electricity through solar energy. Solar power is concentrated in solar power towers and focused into a fluid that bares a fluid. The temperature increases and it turns turbines thereby producing electricity. There are commercially available PV

The Contributions of Mansa Musa to the Greatness of Mali Empire Essay - 3

The Contributions of Mansa Musa to the Greatness of Mali Empire - Essay Example Mansa Musa engaged in numerous conquest of the neighboring kingdoms after his return from pilgrimage which saw him expand the kingdom from all corners. During his journey, he got involved in lavish spending as well as well distribution of goods to the needy. The people in his entourage also took part in the distribution in the Egyptian city of Cairo leading to the collapse of the city’s financial market which was among the largest in the world. As a result, he gained large following especially from the key Islamic scholars and those who were responsible for the building of the city of Cairo. They followed him back to his empire after which he used them in the building of the major cities in the region. They first built the city of Timbuktu into one of the leading pioneers of Islamic academic and financial centers. As a result, Timbuktu became the leading trading center in Africa that can be compared to the present Wall Street. Trade in the city mainly involved gold, slaves, ko la nuts, cashew nuts among other items. This led into the city is at the same level with other cities in Europe such as Paris, Madrid, and Venice in terms of intellectual capacity, economic growth, population and political stability (Alexander, 201-321). Mansa Musa embarked on major construction initiatives that included the building and establishment of mosques and madrasas. Example include the Sankore Madrasah commonly known as the University of Snake which was built during his reign and have remained up to the present age. Musa brought about the modern educational system in the kingdom by re-staffing the University of Sankore with a team of learned astronomers, scientists, mathematicians and jurists who made a great influence in the University thus making it the center for learning and cultural experience.