Hydrochloric acid and calcium carbonate Essay Example for Free

Hydrochloric acid and calcium carbonate Essay Resistance is measured in ohms. A light bulb has resistance. The filament resists the flow of electricity, and glows white hot in doing so. The resistance causes the bulb to only allow a portion of the current available in the wall socket, to flow out. A 100-watt light bulb uses more electricity from the wall than a 60-watt light bulb because the filament in a 100-watt bulb has less resistance to it. This lower resistance allows more current to flow through the bulb, consuming more power, producing more work and making more light. This work, by the way, is called Wattage. If you multiply the voltage times the current answer is in watts. Prediction for length I predict that when the length of the conductor, in this case constantan, is increased, the electrical resistance will subsequently increase. This means that the resistance is directly proportional to the length. For example, when the length is doubled, the resistance is doubled, and when the length is tripled, the resistance is tripled. Therefore, by taking 3 lengths of 10cm wire and putting them in series, one by one, the resistance of the circuit should, at first, double, and then triple. Total Resistance = Resistance1 + Resistance2 + Resistance3 Total Resistance = 3 x Resistance This shows that the resistance is directly proportional to the length. This may happen because; a conductor is made up of a lattice of atoms surrounded by a sea of free electrons (found in the outer shell of the constantan atoms. ) The free electrons jump from atom to atom and form the net flow of electrons around a circuit. Before a power supply is switched on, the free electrons are simply bouncing around inside the conductor. However, once the power supply is switched on, the free electrons are pulled through the circuit towards the positive terminal, and pushed away from the negative terminal, therefore creating the net flow of electrons. This ensures that there is always the same amount of electrons in the conductor, in this case constantan, at any given time. However, constantan is made up of atoms, which are very tightly packed together, only moving in tiny vibrations. To flow around the circuit, the electrons must use a lot of energy to get through these atoms. They crash and collide into the atoms causing them to vibrate a lot more rapidly and vigorously. This vibrating causes a change in energy from kinetic energy to heat energy, or friction. As the atoms movement increases and the metal becomes hotter, the electrons find it harder to flow. The friction is the cause of the resistance in the circuit. Therefore, using this theory, by increasing the length of the constantan, the resistance should increase, as more collisions of the electrons and the atoms will take place. Equation Electric energy Kinetic energy Heat energy Prediction for Thickness Electricity in a wire is due to the flow of free electrons. The more of these that flow every second, then the greater the current. A resistance controls the current. The bigger the resistance then the smaller the current. In a previous experiment that I did, I found out that when two 10 ohme resistors are put parallel then the resistance is halved, this is because the resistance is inversely proportional to the thickness. I am basing my prediction on an analogy that I have been told. If you were at a football game and you were queuing up to get in at the turnstiles and there was only one turnstile open. It would take a long time to get through, but if you were to open another turnstile then it would take half the time to get in because some of the people have moved to the other turnstile. Picture of turnstiles So I am going to predict that when the thickness is increased then the resistance is halved. Fair Test To make this experiment a fair test, I did the following;   Made sure the circuit was in proper working order by putting a resistor in the circuit that I new the resistance of. I made sure the wire was cut exactly to the length required. I used the same wire, Constantan.   I changed the power, so I could take two readings in order to take an average. Results Length(cm) V1(volts) A1(amps) V1/A1(ohms) V2(volts) A2(amps) V2/A2(ohms) Average V/A(Ohms Length(cm) 170 150 130 110 90 70 50 30 Average V/A 37. 25 31. 405 27. 73 24. 98 19. 98 15. 53 11. 7 7. 29 Thickness(mm) V1(volts) A1(amps) V1/A1(ohms) V2(volts) A2(amps) V2/A2(ohms) Average V/A(Ohms 0Thickness(mm). 1/Thickness 5Conclusion for Length In the experiment for length, How does the Length of a wire affect the resistance, I found that my results show that the longer the wire is in length then the higher the resistance. Length graph Conclusion from Graph In my prediction, I stated that:   When the length of the conductor was increased, the electrical resistance will increase. The resistance was directly proportional to the length e. g. When the length is doubled, the resistance is doubled, and when the length is tripled, the resistance is tripled. These points are proven by this graph because it is a straight line which means that the resistance is directly proportional to length. Conclusion for Thickness In the experiment How does the thickness of a wire affect the resistance of a wire, I found that my results showed me that the resistance is affected by the thickness of a wire, when the wire has a bigger diameter then the resistance is much lower. Thickness graph Conclusion from Graph There was an unexpected result on this graph. I expected it to be a straight line so that the resistance was directly proportional to one divided by thickness. But as you can see it has come out as a curved line. Show preview only The above preview is unformatted text This student written piece of work is one of many that can be found in our GCSE Electricity and Magnetism section.

Wall Street Crash of October 1929 Essay -- Great Depression Economics

Wall Street Crash of October 1929 The roaring twenties saw a great deal of prosperity in the United States economy. Everything seemed to be going well as stock prices continued to rise at incredible rates and everyone in the market was becoming rich. Two new industries: the automotive industry, and the radio industry were the driving forces of this economic boom. These industries were helping to create a new type of market that no one had ever seen in history. With the market continuously increasing and with no foreseeable end, many individuals were entering the market because they saw the market as a sure fire way to get rich quickly. The rising prices of stocks and the large increases in trading created the speculative market that would eventually crash. On Monday, October 28, 1929, New York seemed to be the primary focus of the entire world. During that week in October, the bottom of the New York stock market fell out, an event that would lead the world into the greatest depression it has ever seen to date . Many individuals including those in the Federal Reserve Board saw the crash as a healthy thing that would bring all speculative trading to an end, and bring stock prices down to â€Å"realistic† levels. Following the crash the Fed followed a contractionary policy, which does not encourage expansion. Although that type of policy did need to be implemented prior to the crash, the decision to implement contractionary policy after the crash at best can be considered a questionable decision. The unstable financial situation of the United States that lead to the great crash can be attributed to the lack of leadership and action of the Federal Reserve in the financial world during the roaring twenties. After the end... ...31 Oct. 1929 9. â€Å"Stocks Up Again on Flood of Buying; Discount Rate Cut Here and in London; Back to Normal, Reserve Board Finds.† The New York Times 1 Nov. 1929 10. â€Å"Brokers See End of Stock Hysteria.† The New York Times 1 Nov. 1929 11. Herbert Hoover, The Memoirs of Herbert Hoover (New York: Macmillan, 1952) 12. L. V. Chandler, Benjamin Strong, Central Banker (Washington DC: Brookings Institute, 1958) 13. â€Å"Behind the scenes with the Federal Reserve Board,† World’s Work (June 1929) 14. Excerpts from the Hamlin Diary - http://memory.loc.gov/cgi-bin/ampage?collId=amrlm&fileName=mn02page.db&recNum=0&itemLink=r?ammem/cool:@field(DOCID+@lit(mn023))%23mn02003&linkText=1 15. Appendix 1: can be found at www.duke.edu/~wem3/ click on work stuff then under HST104 16. Appendix 2: can be found at www.duke.edu/~wem3/ click on work stuff then under HST104 Wall Street Crash of October 1929 Essay -- Great Depression Economics Wall Street Crash of October 1929 The roaring twenties saw a great deal of prosperity in the United States economy. Everything seemed to be going well as stock prices continued to rise at incredible rates and everyone in the market was becoming rich. Two new industries: the automotive industry, and the radio industry were the driving forces of this economic boom. These industries were helping to create a new type of market that no one had ever seen in history. With the market continuously increasing and with no foreseeable end, many individuals were entering the market because they saw the market as a sure fire way to get rich quickly. The rising prices of stocks and the large increases in trading created the speculative market that would eventually crash. On Monday, October 28, 1929, New York seemed to be the primary focus of the entire world. During that week in October, the bottom of the New York stock market fell out, an event that would lead the world into the greatest depression it has ever seen to date . Many individuals including those in the Federal Reserve Board saw the crash as a healthy thing that would bring all speculative trading to an end, and bring stock prices down to â€Å"realistic† levels. Following the crash the Fed followed a contractionary policy, which does not encourage expansion. Although that type of policy did need to be implemented prior to the crash, the decision to implement contractionary policy after the crash at best can be considered a questionable decision. The unstable financial situation of the United States that lead to the great crash can be attributed to the lack of leadership and action of the Federal Reserve in the financial world during the roaring twenties. After the end... ...31 Oct. 1929 9. â€Å"Stocks Up Again on Flood of Buying; Discount Rate Cut Here and in London; Back to Normal, Reserve Board Finds.† The New York Times 1 Nov. 1929 10. â€Å"Brokers See End of Stock Hysteria.† The New York Times 1 Nov. 1929 11. Herbert Hoover, The Memoirs of Herbert Hoover (New York: Macmillan, 1952) 12. L. V. Chandler, Benjamin Strong, Central Banker (Washington DC: Brookings Institute, 1958) 13. â€Å"Behind the scenes with the Federal Reserve Board,† World’s Work (June 1929) 14. Excerpts from the Hamlin Diary - http://memory.loc.gov/cgi-bin/ampage?collId=amrlm&fileName=mn02page.db&recNum=0&itemLink=r?ammem/cool:@field(DOCID+@lit(mn023))%23mn02003&linkText=1 15. Appendix 1: can be found at www.duke.edu/~wem3/ click on work stuff then under HST104 16. Appendix 2: can be found at www.duke.edu/~wem3/ click on work stuff then under HST104

Business Task 2 on reflection Essay

                 UAE otherwise known as United Arab Emirates is amalgamation of 7 Emirates namely Umm Al, Quwain, Ras Al Khaimah, Ajman, Sharjah, Dubai, Abu Dhabi, and Fujairah. UAE is the second biggest Arabian Middle East economy. The United Arab Emirates is the number 3 biggest in this region in crude oil exporting, following Iran and Saudi Arabia. It possesses the number 6 biggest recognized conservative crude oil reverse and the 5th biggest natural gas reserves. The swift growth in demand of water and electricity has generated the necessity to appraise unconventional power generation sources. In the year 2008, the United Arabs Emirates produced energy white paper on study of energy that confirmed that nuclear power to be environmentally friendly and safe alternative which would increment the prevailing plants of power in accomplishing increasing energy requirements. 2.1 Objective of this study accomplishment                The objective of this study of examining whether ownership structure matters for the performance of firms in United Arabs Emirates was achieved. Empirical evidence suggests that privately held firms tend to be more efficient and more profitable than publicly held firms. This shows that ownership structure matters. The question now is how does it affect firm performance? This question is very important because it is based on a research agenda that has been strongly promoted by La Porta et al. (1998; 1999; 2000). According to these studies, failure of the legislative framework to provide sufficient protection for external investors, entrepreneurs and founding investors of a company tend will maintain large positions in their firms thus resulting in a concentrated ownership structure.                  This paper aimed at looking at whether ownership structure has an impact on firm performance in UAE. This region has witnessed significant economic growth over the last few decades. The region is also facing turbulent times with respect to corporate governance practices, resulting in poor firm performance. Corporate governance issues are not limited to the Gulf region. From a global point of view, corporate governance has witnessed significant transformations over the last decade (Gomez and Korine, 2005).                The data that is used in this study includes 362 non-financial listed firms during the period of 2006-2011 from Thomson one banker, Thomson.com, DataStream and annual report. Panel data is used to analyse the impact of ownership structure on firm performance number of independent directors on the board are controlled for. The different types of ownership structure that are included in the study are: managerial ownership, family ownership, government ownership, institution ownership, foreign ownership and concentrated ownership. Evidence personal learning and development 1.0 Effects of structure on firm performance                  It is indisputable, managerial ownership, Chairman own share, institutional investors, corporate total own, institutional owner domestic and corporate foreign all have positive effects on firm performance. The evidence is also consistent with theoretical and empirical arguments. On the contrary, When Return on Assets (ROA) is used as a measure of performance; the evidence shows that government ownership has negative effects on firm performance in United Arab of Emirates oil firms. Therefore, performance of United Arab of Emirates oil companies is affected by government ownership.                  The relationship between performance and ownership structure also differs for firm specific variables such as leverage, GDP growth and firm size. When the Tobin’s Q is used, the relationship is negative for leverage, GDP growth and firm size. The negative and significant impact of firm size on firm performance when Tobin’s Q is used can be attributed to the fact that large firms have limited investment opportunities, which limit their potential to grow and make profit. Surprisingly, the impact of GDP growth is significantly negative. However, when ROA is used, we did not find any significant relationship with firm performance in United Arab of Emirates oil firms.                   This study also shows that there may be a necessity to motivate policy makers of United Arab of Emirates oil firms to ensure that banks practice the mechanisms of corporate governance effectively. This practice should be compatible for the business environment of United Arab of Emirates oil firms, whereas adopting the same governance standards in order to ensure unification of disclosure level among the banks. It is expected that the best practice of the corporate governance characteristics will contribute to improve efficiency, effectiveness and monitoring in the Islamic banks of UAE. Therefore, this can only be applied by developing the regulatory and compelling frameworks.                  In the last 4 decades, researchers have believed that there is a connection between the firm performance and the ownership structure. In this regards, there has been publications of many studies on different markets to inspect this relationship. This connection between performance and ownership structure dates back to empirical study of Mean and Berle in the year 1932 that got that the weakness of shareholding in a negative way influence the performance of affirm via an inverse relationship. Generally, the number of well-developed policies and the present legal systems are poorly developed in the markets that are emerging. These new markets, according to most analysis studies, lack protection for their creditors and shareholders (La Porta, 1999). 2.0 Ownership structure in relation to firm performance                  The issue as to whether ownership structure matters for the performance of firms has been an important subject of debate in the finance literature. Empirical evidence suggests that privately held firms tend to be more efficient and more profitable than publicly held firms. This shows that ownership structure matters. The question now is how does it affect firm performance? This question is very important because it is based on a research agenda that has been strongly promoted by most researchers in economics. According to these studies, failure of the legislative framework to provide sufficient protection for external investors, entrepreneurs and founding investors of a company tend will maintain large positions in their firms thus resulting in a concentrated ownership structure. This finding is interesting because it implies that ownership structure can affect the performance of the firm in one way or the other. It is indisputable; the lack of regulations in corporate governance gives managers who intend to mishandle the flow of cash for their own personal interest a low control level. The empirical results from the past studies of impacts of ownership structure on performance of corporate have been inconclusive and mixed up. References Gomez, P.Y. & Korine, H. 2005, Democracy and the Evolution of Corporate Governance. Corporate Governance, 13, 739-752. La Porta, R., L. et al. 1999, Corporate ownership around the world. The Journal of Finance, 54(2), 471–517. Source document

Background of Public Bank and Security Threats Problem

Public Bank Malaysia was established in 6 August 1966 by Tan Sri Dato’ Sri Dr. Teh Hong Piow, and was listed on the Kuala Lumpur Stock Exchange (KLSE) on 6 April1967 (Public bank corporate profile, n.d.). The headquarters of the bank is situated in Kuala Lumpur, the capital city of Malaysia. According to Public Bank Corporate Profile (n.d.), the Public Bank Group is the third largest banking group in Malaysia with total assets of RM274.62 billion at the end of 2012, and ranked number six by asset size in Southeast Asia. Public Bank also known as the largest non-government-linked corporation in Malaysia (Public Bank Corporate Profile, n.d.). Data retrieved from http://1-million-dollar-blog.com/2011-ranking-of-malaysian-banks-based-on-assets-size-market-capitalization/. The mission of Public Bank is to â€Å"sustain the position of being the most efficient, profitable and respected premier financial institution in Malaysia† (Public bank corporate profile, n.d.). To achieve their goal, Public Bank cares for its customer, employees, shareholders and community to let everyone can satisfied with their services. To be ranked among the top 100 banks in the world is the vision of the bank. Problem Until now, security threat is always a challenge for Public Bank Malaysia Berhad. A security threat can be known as a possible cause that may harm to a system or an organization and even its assets (Information Management, n.d.). 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