Esistance and conductive putty Essay Example for Free

Esistance and conductive putty Essay The aim of this investigation is to find out the relationship between resistance and conductive putty, and to see how length of putty affects this relationship. The Experiment: Conductive putty is specially designed to be a conductor; this is achieved by adding carbon black. This can easily be used to prove the concept of resistivity because it is malleable and so the cross-sectional area, length and shape can easily be changed. This experiment will show the effects on resistance in a circuit, as the length of putty decreases. I will be using 30cm of putty, and decreasing it by 5cm each time. First the voltage of the battery will be taken using a voltmeter, and this will be recorded at the start of the experiment. Then a circuit will be constructed containing the battery, the ammeter and putty. See diagram. For each different length of putty, a reading will be recorded from the ammeter and when the practical has been completed, I will work out the resistance using the formula R=VI. From those results I will draw a graph and then evaluate and conclude my experiment. Diagram: Constants: My constants include the weight of my putty I am going to start each experiment with 50g of putty. I will also sustain the same thickness of putty throughout my experiment, and the same battery will be used constantly. Variables: Possible variables in this experiment are temperature, voltage, cross-sectional area, mass, surface area and length. My variable is going to be the length of my putty, which will decrease by 5cm each time. I am going to start each experiment, using 30cm of putty. Fair Test: To ensure my results are as accurate as possible, I will make sure my experiment is a fair test. For this, there should only be one variable. Other procedures can ensure it is a fair test, such as accurately measuring the putty to make sure it is decreased by 5cm exactly every time. The same battery should be used throughout the experiment and to guarantee no results are anomalous, the experiment will be conducted three times and a mean average will be taken from each result. Prediction and Hypothesis: I predict that the resistance will be directly proportional to the length of the conductor so that if the length is doubled, the resistance will double providing all other factors remain constant. My hypothesis for this is that conductors have lower resistance when they are shorter because the electrons have a shorter distance to travel so more energy is conserved since there are fewer collisions, and the current is higher. In the longer lengths, as free electrons move from atom to atom some energy given off to heat. The longer a conductor is, the more energy is lost to heat. The additional energy loss subtracts from the energy being transferred through the conductor, resulting in a decrease in current flow and an increase in resistance Safety: The conductive putty is a harmless, non toxic and non-staining, however if gloves are not worn, your hands become black and you will need to wash them. A lab coat should be worn to minimize marks on clothes and the experiment is conducted on a tray to reduce the possibility of a messy workspace. Apparatus list: 50g of conductive putty 2 coins Tray to work on Knife Ammeter Ruler Voltmeter Wires Crocodile clips Gloves Method: Put on gloves and rolled putty into 30cm long piece on the tray, trying to keep the thickness consist ant. Used voltmeter recorded the voltage of the battery. Connected battery to ammeter, and connected ammeter and other terminal of battery to putty by putting crocodile clips on the ends of the wires, clipping them to coins and placing coins at either end of the putty, this was done to make a reliable connection. See circuit diagram. Recorded reading from ammeter. Measured 5cm of putty with ruler and cut with knife. Re-attached putty to circuit. Repeated process, deducting 5cm from puttys length each time, recording the reading from the ammeter. Repeated experiment three times, which will enable me to spot anomalous results. Results: I have calculated the resistance using the formula: R=V/I. Resistance is measured in ohms and the unit uses the symbol ?. Experiment 1 battery voltage = 6. 12V: Length of putty in cm Amps in A Resistance in ? Analysis of Results: This graph shows me the results for all three of my experiments, and there is a line of best fit for each experiment. There are some inaccuracies as the voltage was slightly different for each experiment, and I feel that points for the later experiments are also out. This is visible in my results and is maybe due to the fact that the same piece of putty was used for all three experiments, and so heat from my hands must have affected results. I have taken the averages of my results. Length of putty in cm Resistance in ? These are my average results. These results were plotted on a graph (see graph) and they show a visible decrease in resistance as the length of putty decreases. This would prove my prediction and hypothesis to be correct, as it states that the putty will have lower resistance when the length is shorter rather than longer or the resistance of a conductor is directly proportional to its length; due to factors such as loss of energy to heat, higher rate of collisions etc.(see prediction and hypothesis) However, when looking at my graph I noticed that the two points representing the shortest lengths of putty were out. This could be because as the putty was being worked, rolled and cut throughout the experiment it had become warmer and softer due to the heat from our hands; this could have affected the resistance. Evaluation: My results have proven my prediction and hypothesis to be correct, in that resistance is directly proportional to the length of the conductor, in this case the conductive putty. I think my results were quite accurate, but what may have let them down was the fact that the batterys voltage was slightly different for each experiment and the coins used to connect the wire to the putty, did not stay in place very well. I also noticed there was often a big jump in amps and resistance between 10cm and 5cm of putty. This can be seen by looking at my results and the graph, and I have concluded that this is probably caused by my hands transferring heat to the putty by means of conduction, as the putty is regularly in contact with my hands during the experiments. I expect this could be separate experiment, in which we could investigate how temperature affects resistance. If this experiment was going to be redone, then I think I might use a new battery for each experiment, and record the voltage as constant for all experiments. Also I would maybe use a different method to connect the wires to the putty, like maybe sticking the wires directly and vertically into the ends of the putty. Another thing to do would be to use temperature or even cross-sectional area as a variable alongside length, and to do a series of experiments involving increasing the length while decreasing the cross-sectional area, and vice versa. Conclusion: I think this experiment was a success in that it proved the theory that resistance is lower with shorter lengths of conductor and my hypothesis declares that as the electrons have a shorter distance to travel if the length is shorter, there are fewer collisions and less energy is lost to heat unlike in a longer length of conductor, so the putty will have lower resistance. Therefore my hypothesis was correct and I have successfully concluded my experiment proving that resistance is directly proportional to the length of conductor. 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.

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Pets are important members of the family. In more than 60% of households in the United States today according to Jill Weisenberger Rachel Bajema owns a pet. A veterinarian is a person qualified to treat diseased or injured animals. Pets of home owners are not their only patients. Vets can also look after zoo animals, livestock, and animals in sport. Vets can also help with animals’ diseases that can infect humans. A veterinarian job is very important. Animals are important to human life, both to share affection, and financial purposes, and a vets job is to make sure they are healthy and stay that way. What we call "veterinary medicine† has been around as long as people and animals have worked and lived together, according to â€Å"Care of pets, and a history of Veterinary medicine.† The veterinarian dates back from 4,000B.C up to 2,500. The earliest veterinarian work was found in China, Rome, Egypt, and Europe. People that study history have found Chinese writings about the diseases of horses, oxen, and buffalos that dates all the way back to about 2,500 B.C. In about A.D. 500 a Roman wrote a book on what veterinarians do to help animals. Nothing else was written after that until a thousand years later when another book was written. Yet, there were those like Romans that had to learn their skills by working directly with the animals. The first school that taught people about scientific veterinary medicine was in Europe in the mid-eighteenth century-less than three hundred years ago. It has become more famous as time went by. In the end of the nineteenth century, veterinary schools had been established in the United States and also in many other countries. In veterinarian medicine, there are two positions. One of the positions is... ...colonies and the use of high-density housing systems are also increasing the risk of infection and complicating the ability of veterinarians to detect infectious agents. That’s why veterinarians are very important, to animals and humans according to Bennett, Justin C, animal scientist. With put veterinarian’s many diseases that rodents transmit would be infecting humans. Becoming a veterinarian would be a lot of work. It would take a good few years, and training. However, becoming a veterinarian assistant, and studying to become a veterinarian, can help a lot. I can get work experience, and understand many things faster and easier. Being accepted into veterinarian school seems hard but not impossible. From this paper I learned that I have lots of math and science classes to take. How long it will take to become a veterinarian and what it takes to become one.

Independent Auditors’ Management Letter Essay

To the Honorable Board of County Commissioners of Lee County, Florida: We have audited the financial statements of the governmental activities, the business-type activities, each major fund, and the aggregate remaining fund information of Lee County, Florida (the â€Å"County†) as of and for the year ended September 30, 2011, and have issued our report thereon dated March 8, 2012. We conducted our audit in accordance with auditing standards generally accepted in the United States of America; the standards applicable to financial audits contained in Government Auditing Standards, issued by the Comptroller General of the United States; and OMB Circular A-133, Audits of States, Local Governments, and NonProfit Organizations. We have issued our Independent Auditors’ Report on Internal Control over Financial Reporting and on Compliance and Other Matters Based on an Audit of Financial Statements Performed in Accordance with Government Auditing Standards, Independent Auditorsà ¢â‚¬â„¢ Report on Compliance with Requirements that Could Have a Direct and Material Effect on Each Major Federal Awards Program and State Financial Assistance Project and on Internal Control Over Compliance, and Schedule of Findings and Questioned Costs. Disclosures in those reports and schedule, which are dated March 8, 2012, should be considered in conjunction with this management letter. Additionally, our audit was conducted in accordance with Chapter 10.550, Rules of the Auditor General, which governs the conduct of local governmental entity audits performed in the State of Florida. This letter includes the following information, which is not included in the aforementioned auditors’ reports or schedule. Section 10.554(1)(i)1., Rules of the Auditor General, requires that we determine whether or not corrective actions have been taken to address findings and recommendations made in the preceding annual financial audit report. There were no findings and recommendations made in the preceding annual financial audit report with respect to the Board of County Commissioners (the â€Å"Board†). With respect to the Clerk of the Circuit Court, Property Appraiser, Sheriff, Supervisor of Elections, and Tax Collector (collectively the â€Å"County agencies†), reference to whether corrective actions have been taken is provided in separate management letters for each County agency. Section 10.554(1)(i)2., Rules of the Auditor General, requires our audit to include a review of the provisions of Section 218.415, Florida Statutes, regarding the investment of public funds. In connection with our audit of the financial statements of the County, nothing came to our attention that would cause us to believe that the County was in noncompliance with Section 218.415 regarding the investment of public funds. Section 10.554(1)(i)3., Rules of the Auditor General, requires that we address in the management letter any recommendations to improve financial management. In connection with our audit of the Board, we did not have any such findings. Reference to such matters is provided in separ ate letters for each County agency, where applicable. Section 10.554(1)(i)4., Rules of the Auditor General, requires that we address violations of provisions of contracts or grant agreements, or abuse, that have occurred, or are likely to have occurred, that have an effect on the financial statements that is less than material but more than inconsequential. In connection with our audit, we did not have any findings other than those reported in the Schedule of Findings and Questioned Costs. Section 10.554(1)(i)5., Rules of the Auditor General, provides that the auditor may, based on professional judgment, report the following matters that have an inconsequential effect on financial statements, considering both quantitative and qualitative factors: (1) violations of provisions of contracts or grant agreements, fraud, illegal acts, or abuse, and (2) deficiencies in internal control that are not significant deficiencies. Reference to such matters is provided in Appendix A for the Board. We did not audit the responses to our recommendations, which are also provided in Appendix A, and, accordingly, we express no opinion on them. Reference to such matters is provided in separate management letters for each County agency, where applicable. Section 10.554(1)(i)6., Rules of the Auditor General, requires that the name or official title and legal authority for the primary government and each component unit of the reporting entity be disclosed in the management letter, unless disclosed in the notes to the financial statements. Such disclosure is included in the notes to the financial statements. Section 10.554(1)(i)7.a., Rules of the Auditor General, requires a statement be included as to whether or not the local governmental entity has met one or more of the conditions described in Section 218.503(1), Florida Statutes, and identification of the specific condition(s) met. In connection with our audit of the financial statements of the County, the results of our tests did not indicate the County met any of the specified conditions of a financial emergency contained in Section 218.503(1). However, our audit does not provide a legal determination on the County’s compliance with this requirement. Section 10.554(1)(i)7.b., Rules of the Auditor General, requires that we determine whether the annual financial report for the County for the fiscal year ended September 30, 2011, filed with the Florida Department of Financial Services pursuant to Section 218.32(1)(a), Florida Statutes, is in agreement with the annual financial audit report for the fiscal year ended September 30, 2011. Our comparison of the financial report filed with the Florida Department of Financial Services to the County’s 2011 audited financial statements resulted in no material differences. Pursuant to Sections 10.554(1)(i)7.c. and 10.556(7), Rules of the Auditor General, we applied financial condition assessment procedures as of September 30, 2011. It is management’s responsibility to monitor the County’s financial condition, and our financial condition assessment was based in part on representations made by management and the review of financial information provided by same. This letter is intended solely for the information and use of management, the Board of County Commissioners of Lee County, Florida, the Florida Auditor General and applicable federal and state agencies, and is not intended to be and should not be used by anyone other than these specified parties. Orlando, Florida March 8, 2012 LEE COUNTY, FLORIDA Appendix A – Management Letter Comments For the fiscal year ended September 30, 2011 Observation 2011-A Statement of Condition: The Clerk’s Finance and Records Department periodically reviews construction in progress with the County departments to determine which projects should be capitalized and depreciated. However, we noted during our audit that the governmental activities construction in progress balance at September 30, 2011 included certain projects that had been completed or abandoned before year-end. Criteria: Construction in progress projects should be reclassified to depreciable assets once substantially completed and available for service. If the County determines a project is no longer viable, the construction in progress should be expensed. Effect of condition: Construction in progress for governmental activities in the amount of $8,061,000 was not reclassified as depreciable assets at September 30, 2011, and related depreciation expen se and accumulated depreciation were not recorded. In addition, the County expensed $1,242,000 of construction in progress for a project that was abandoned. Cause of condition: The process in place for notification of when construction in progress is substantially complete and available for service or when projects are no longer viable, was not sufficient to identify such projects for proper recording. Recommendation: We recommend that County departments be more diligent in reviewing the status of construction in progress and notify the Clerk’s Finance and Records Department when projects are substantially complete and available for service or when they determine a project should be abandoned. Management’s response: We have asked our external auditors to provide instruction to the Board’s fiscal personnel on this matter, including the importance of capitalizing or writing off construction in progress in a timely manner. Observation 2011-B Statement of Condition: The cost of interest related to borrowings on construction in progress had not been sufficiently capitalized prior to audit review. Criteria: Accounting principles state that interest shall be capitalized for assets in enterprise funds that are constructed for the enterprise’s own use if the effect of expensing such interest is material. Effect of condition: Capitalized interest cost related to construction in progress was recalculated and recorded in the amount of approximately $1 million. Cause of condition: The calculation of capitalized interest had not included all construction in progress on which interest was to be capitalized. Recommendation: We recommend that the Clerk’s Finance and Records Department review construction in progress annually and determine the amount of interest that should be capitalized. Management’s response: The issue was related to accruing interest for construction in progress based on the total amount of construction in progress rather than the amount that was capitalized in the current year. This has been corrected. LEE COUNTY, FLORIDA Appendix A – Management Letter Comments For the fiscal year ended September 30, 2011 Observation 2011-C Statement of Condition: During our testing of cash management compliance for the Emergency Operations Center State grant, it was noted that $138,000 of expenditures, out of $849,000 in total, were not requested for reimbursement in the annual reimbursement request. Criteria: Reimbursements requests should include all expenditures for which the County has disbursed payment to vendors for the specific time period. Effect of Condition: Reimbursement for certain invoices was not requested and the County did not receive all of the monies to which it was entitled in a timely manner, which could result in cash flow issues for the program. Cause of Condition: The County did not reconcile the reimbursement request to the accounting records. Recommendation: We recommend that management establish a process to reconcile to the accounting records when preparing reimbursement requests. Management’s Response: Future requests for reimbursement will be made in the same year that they were expended. Observation 2011-D Statement of Condition: The County’s practice has been to write off uncollectable EMS receivables as bad debt expenditures. Criteria: Discounts and allowances in revenue-related governmental fund accounts should be recorded as revenue reductions, rather than as bad debt expenditures. Effect of Condition: EMS revenues and bad debt expenditures were overstated by $6,106,000. This also created a financial statement budget variance because bad debt expenditures have been recorded but not budgeted. Cause of Condition: The long-standing County practice has been to record all uncollectable receivables as bad debt expenditures. Recommendation: We recommend that management modify accounting practices to reduce revenue for uncollectable revenue-related governmental fund accounts receivable. Management’s Response: We will look at this issue in the upcoming fiscal year and handle it appropriately.

Analysis of I Know What You Did Last Summer Essays

Analysis of I Know What You Did Last Summer I Know What You Did Last Summer directed by Jim Gillespie. The film; based on four high school graduates. A crazy night of fun turns to fright as the fearful four knock down a passing figure. In a moment of despair the group decide to dump the body in a near by lake. The four then head off on their travels to collage work, when a year later is reunited back home for summer break. The four all begin receiving threats stating I Know What You Did Last Summer. The roller coaster of I Know What You Did Last Summer commences. The film fits into the horror genre with its collection of horror conventions from the damsel in distress scene, blood, mutilated†¦show more content†¦Locations used in the film consist of isolated areas such as beach sites, misty piers, dark alleys, long twisted roads and mysterious houses. All are horror conventions easily fitting into the horror genre. Many scenes show mutilated bodies, blood and guts. In the scene where the four knock over the passing figure we are presented with a mutilated face drenched in blood. This scene is shone instantly in order to shock and disgust the audience. The film continues to show similar horror conventions throughout. A scene with a larger impact then most others is the chase between the murderer and Helen (Sarah Michelle Geller.) As the murder takes place the blood hits the glass as if to stop the blood coming through and falling onto the audience. This is done to make the audience feel theyre in the film. All these murder conventions fit into horror genre. Jim Gillespie has directed the ways the murders take place. In other horror movies the murder itself is constantly shown loosing its affect on the audience. However Jim Gillespie makes sure you see the murders result i.e. the blood on the window. This shows the audience the actual moment the death defying moment. 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