Fruits to make a fruit battery Essay Example

Fruits to make a fruit battery Paper Magnesium, due to its reactivity, has a very high potential energy, so the electrons travel from it to the copper, which has a very low potential energy due to its unreactivity. The difference in the potential is called the cell potential difference. If the difference of potential energy is large, then clearly the voltage produced by the galvanic cell will also be large as voltage is potential difference. From the electrochemical series, magnesium has a standard electrode potential of -2. 37, and copper has one of +0. 34. The difference between the potentials is 2. 71, which is large, and therefore this will mean more electrons will be conducted creating a larger current, and also the difference between the potentials will also mean a higher voltage. If the anode was zinc (-0. 76) then the difference would be 1. 1 not as large a difference as the magnesium due to it being less reactive. Other examples could be zinc and magnesium, a difference of 1. 61, lead (-0. 13) and iron (0. 04), a difference of 17 and so on. This is how galvanic cells operate, storing chemical energy that is released as electrical energy when a conductor is connected between the two electrodes. This scientific theory supports my initial prediction that the magnesium and copper will produce the highest voltage due to their potential energy difference. Evaluation: I think that the experiment went quite well. It is hard to spot anomalous results on a bar graph, but I think my results are pretty accurate, and fit my prediction. However I feel accuracy was limited and could have been improved if a set of 3 results was taken, because I only took 2, it is possible that one result could have been wrong and changed the average, while accuracy is increased with three results. We will write a custom essay sample on Fruits to make a fruit battery specifically for you for only $16.38 $13.9/page Order now We will write a custom essay sample on Fruits to make a fruit battery specifically for you FOR ONLY $16.38 $13.9/page Hire Writer We will write a custom essay sample on Fruits to make a fruit battery specifically for you FOR ONLY $16.38 $13.9/page Hire Writer There was not enough time to do this though. I think that the results gained using zinc and magnesium were more unreliable than the others, because there were big differences between the two results that were taken. For example, using lead and zinc the first time (in the grapefruit) a voltage of 0. 17 was produced, while the second reading was 0. 49V. This could be because we didnt change the metal strips after every fruit, meaning they had been reacting with both the air and the electrolyte/fruit. Accuracy could also have been lacked due to the difficulty in cutting out equal sized strips. We had to use a steel nail of similar surface area because iron foil was unavailable. Fruits are also very unpredictable and vary. I think that we should have perhaps focused on one fruit, like the lemon, and used three different lemons to increase accuracy. This would perhaps be a more useful approach. I believe further investigations are needed to help fulfill the aim of the experiment. I think that acids and alkaline solutions should be used instead of fruits due to their unreliability. This will make the experiment quicker too. The outcome would be more predictable. The distance between the two metals in the fruit could be varied in further work to again test the voltages produced using different combinations of magnesium, iron, zinc, lead and copper. You could start them with a centimetre difference between them, and then increase this by a cm until it reaches 5 cm. A variety of fruits could again be used as a variable in this method. Other variables to be tested are the surface area of the metals and how that would affect the voltage produced, as it clearly seemed to affect my results.

Okonkwo vs Unoka essays

Okonkwo vs Unoka essays Chinua Achebes novel Things Fall Apart is a story about the coming of the white man to Africa and their influence in the ultimate destruction of the primitive, tribal lifestyle of the Africans. Achebe hints at the chaos that arises when a system collapses, and he shows this through Okonkwos and Unokas characters. Although both Okonkwo and Unoka had different circumstances for their deaths, both characters shared a similar fate in that both were unable to adapt to the changing society around them. This is supported through the differing lifestyles of Okonkwo and Unoka, and also through Achebes underlying theme about the effect of society on an individual. The Ibo tribe viewed Unoka as an efulefu, or a person who does not hold any status and was generally ignored by the clan. In his day he was lazy and improvident and was quite incapable of thinking about tomorrow (Achebe 4). By the standards of the clan, Unoka was a coward and a squanderer because he never took a title in his life, borrowed money from his clansmen, and rarely repaid his debts. Also, he never became a warrior because of the fact that he feared the sight of blood. Yet, although he did not rank high in the tribes political and social hierarchy, Unoka was a skilled musician and had a gentle attitude towards life. Unoka was more of a romantic, which set him apart from the chauvinistic ideals of the Ibo tribe. It was because of this, that when Unoka became ill, the tribe neglected to help him but rather felt he deserved to be thrown into the evil forest to die. Had Unoka tried to conform to the standards of the tribe and acted less indolently, he may have stood a better c hance of survival. Unlike Unoka, Okonkwo strived to make a name for himself in a world that valued manliness. Due to the embarrassment he felt over the humiliating and dishonorable lifestyle of his father his whole life was dominated by ...

Entrepreneurship in the Global Environment - Comparing Entrepreneurs Assignment

Entrepreneurship in the Global Environment - Comparing Entrepreneurs from different Industries- Ratan Tata & Warren Buffett - Assignment Example Ratan began his schooling at Campion School and finished the secondary education at John Connon School. He later joined Cornell University for a Bachelor of Science in structural engineering thereby graduating in 1962. Ratan joined the Harvard Business School in 1975 for an Advanced Management Program. Tata’s career beginnings in 1961 involved shoveling limestone and managing the blast furnace at Tata Steel. Thirty years later, J.R.D stepped down as the director of Tata Sons thereby endorsing Ratan as his successor. Ratan’s superb management and entrepreneurial skills created significant success for the company. For instance, the conglomerate acquired Tetley, Jaguar land Rover, and Corus thereby transforming from an Indian Company to a global one. The company currently sources 65% of its revenues from abroad. Ratan highly participated in the creation of Tata Nano, the world’s least costly passenger car. On December 2012, Ratan retired from his chief executive responsibility thereby becoming a chairman emeritus of Tata Group. Ratan continues making new deals and eyeing the evolving business opportunities such as e-commerce. He has also continued a close working relationship with the British Jaguar Land Rover Company. Ratan Tata has other duties both in India and abroad. For instance, he is a member and a contributor in the country’s Trade and Industry ministry. In addition, he is part of the jury of Pritzker Architecture Prize, which is considered an influential prize giving program for architectures. Globally, Ratan possesses key duties. For instance, he is a dean’s advisor at Harvard Business School. His significant contributions to the contemporary society has made earn numerous awards. In 2008, the Government of India awarded Ratan Padma Vibhushan, which is one of the highest civilian honors. Warren Buffett was born in Omaha, in 1930. He is among the three children of the late Congressman, Howard Buffett. Howard