Resistance of a Wire Essay Example for Free

Resistance of a Wire Essay Will changing the length and type of wire affect the resistance? What is my aim of this project: To set up an electric circuit to measure the resistance of the wire. What are my Variables:   Nichrome coil What is resistance? Resistance is measured in (OHMS). It is the hindrance to the flow of charge. Why did we get resistance? An electric current flows when electrons move through a conductor. The electrons that are moving can collide with the atoms of the conductor. This then means that it is more difficult for the current to flow, which causes resistance. On the other hand, electrons have a collision with atoms more often in a longer wire than they do in a short one, however, a thin wire has fewer electrons to carry the current than a thick wire. In a thin wire there is less space, but more resistance and in a long wire there is more space, yet less resistance. The flow of electrons: Hypothesis: Before I do my experiment I predict that the resistance in the wire will increase as the length of the wire increases. I also predict that if the resistance in the wire increases, then the thickness of the wire will decrease. My diagram of my circuit: For my first investigation task I will be doing a preliminary test to find out which are the best wires to use for my investigation. This task was completed and threw my results I realised that using the Nichrome would be better for my investigation. This is what was done before the main experiment. Preliminary test: Length Apparatus Test1 Test2 Test3 Test4 Average Resistance 10cm Ammeter   The graph shows that the data is positive.  From observing this graph above I can see that my data is close fitted along my line of best fit and that the data increases a lot, showing that this is a . as well as this there is s apiece of anomaly data, which is my outlier, circled in black. For my experiment, I will be taking account the differences in resistance between the different lengths of Nichrome wires. This will be tested against copper which, has a low resistance and high current and is thinner than the Nichrome wire that has high resistance and low current. Method. In order for me to complete my investigation, I will need to gather the equipment listed above and set up my electric circuit. This will be done by the use of connecting my wires to the volt meter and ammeter and then attaching crocodile clips on each ends of the wires. It is necessary for the wires to be in this position, as the crocodile clips play an important role in griping the coil firmly whilst the investigation takes place. After doing this I will cut the chosen coil to the measurement I desire. These measurements will be of 10cm, 20cm, 30cm, 40cm and 50cm. With these different measurements, I will attach the coil to the circuit to make it complete. Then, I will turn on the power pack and take down the readings from the voltmeter and ammeter, reading off the voltage and current. From these readings, I will calculate the resistance and average. My results from my readings will be presented in a table. With this experiment, I will keep all the equipment the same however my variables will be the type of wire, the length and the thickness. Repeating my test makes my investigation more reliable. Temperature is a factor that affects the resistance. For each reading I take I will switch off the power pack between each test, making my investigation much more reliable. Below are my table results for Nichrome wire Test (1) The wires length (cm) Voltage (V) Current (A) Resistance (? ) Below is my graph on my results From my line graph I created, I can see that my readings from each test were very alike for each time the experiment was being done. From looking at my results in the graph, there were no outliers. However, it also shows that my hypothesis predicted was correct, because the longer the wire was the more resistance there was it had a low current and a high resistance. Evaluation: I think my investigation worked well against my method and my hypothesis. I was able to complete my aim of this investigation, which enabled me to take down my readings of the current and voltage easily. I found the circuit easy to manipulate with no obstructions, which enabled me to record my results accurately for the resistance of the different lengths of wires. If I had the chance to re-do this project, I would have used a smaller current, because then I wouldnt affect the wires temperature in heating. This would then mean that it wouldnt affect the resistance of the wire being tested. As well as this I would use longer measurements of wire instead of just testing up to 50cm and test more different types of wires. Lastly, I feel that my experiment went well, which achieved its aim. 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.

Literary Essays :: Literature

In literary essays, students are exploring meaning and construction of a piece of literature. In a review students are discussing overall effect and validity of written work, while in a literary essay students are paying more attention to specifics. Students are taking a piece of writing and trying to discover how and why it is put together way it is. Students must adopt a viewpoint on work in question and show how details of work support their viewpoint. Like the novel, the essay is a literary device for saying almost everything about almost anything. By tradition, almost by definition, the essay is a short piece, and it is therefore impossible to give all things full play within the limits of a single essay. But a collection of essays can cover almost as much ground, and cover it almost as thoroughly, as can a long novel. Montaigne's Third Book is the equivalent, very nearly, of a good slice of the Comà ©die Humaine. Essays belong to a literary species whose extreme variability can be studied most effectively within a three-poled frame of reference. There is the pole of the personal and the autobiographical, there is the pole of the objective, the factual, the concrete-particular, and there is the pole of the abstract-universal. Most essayists are at home and at their best in the neighborhood of only one of the essay's three poles, or at the most only in the neighborhood of two of them. There are the predominantly personal essayist s, who write fragments of reflective autobiography and who look at the world through the keyhole of anecdote and description. There are the predominantly objective essayists who do not speak directly of themselves, but turn their attention outward to some literary or scientific or political theme. †¦ And how splendid, how truly oracular are the utterances of the great generalizers! †¦ The most richly satisfying essays are those which make the best not of one, not of two, but of all the three worlds in which it is possible for the essay to exist The research essay leads students into works of others and asks students to compare their thoughts with their own.

Policing in American Society

Policing in American Society Kathleen Kloos CJA 214 November 8, 2011 Douglas Edwards Policing in American Society The relationship between the U. S. government and all policing organizations throughout the U. S. is necessary because policing organizations cannot function without government support. Government provides support in the form of training, civilian staff, funding, corrections, and judicial support (Grant, 2008). Administrative support from the U. S. overnment can be seen by looking at the Office of the Coroner, which has the responsibility to investigate violent or suspicious deaths. This office determines cause of death and provides the proof of a homicide, or crime, to the law enforcement agency to pursue criminal charges. U. D. government changed their structure in regards to law enforcement and investigation after the events of September 11, 2001. Many departments and agencies became restructured to answer to either the Department of Homeland Security or the Department of Justice (Grant, 2008.The Department of Homeland Security oversees: Customs and Border Protection Immigration and Customs Enforcement (ICE) Federal Emergency Management Agency (FEMA) Transportation Security Administration (TSA) U. S. Coast Guard U. S. Secret Service The Department of Justice is in charge of: Drug Enforcement Administration Federal Bureau of Investigation Bureau of Alcohol, Tobacco, Firearms, and Explosives U. S. Marshals Service Federal Bureau of Prisons The relationship between the U. S. government and policing agencies can be described as co-dependent.Neither can exist without the other. Decisions handed down by the U. S. Supreme court dictate future police procedures. Cases such as Mapp v. Ohio, Miranda v. Arizona, and Fuhrman v. Georgia have changed the way police agencies investigate and charge offenders who eventually end up in prison. Police are no longer able to question a suspect without first advising the suspect of their Miranda rights (Miranda v. Ariz ona). Illegal search and seizure is no longer admissible in court (Mapp v. Ohio).Cruel and unusual punishment is no longer tolerated (Fuhrman v. Georgia) (AllGov, 2011). The criminal justice system exists by making each branch dependent upon the other. Police agencies investigate the crime, take custody of the suspect, recommend charges to be filed against the offender, then hand the case off to the judicial branch to adjudicate. Once the case has been tried, if the defendant has been convicted, or pled guilty, the corrections department takes over and makes sure the defendant serves his/her sentence.The impact of this relationship on American society insures that the citizens of this country feel safe. The impact shows criminals that society will not tolerate crimes against society. This relationship is a constant work in progress. Just like any relationship. References Gov, A. (2011). AllGov. Retrieved from http://www. allgov. com/Agency/Federal_Law_Enforcement_Training_Center Gra nt, H. B. , & Terry, K. J. (2008). Law Enforcement in the 21st Century (2nd ed. ). Unknown, AZ: Pearson Education.

The Nurture Assumption By Judith Harris - 2120 Words

Kathryn Riis Ap English Mrs. Baer 3 December 2014 Parents Do Matter Section 1: Introduction and Context: The nurture assumption by definition is the assumption that the way a parent raises a child has a long term effect on the child. In Judith Harris’ book, The Nurture Assumption, she argues against the nurture assumption and claims it is false. Now if that were true than what is the point of a parent even trying to communicate with their child? What’s the point of a parent trying to be a good role-model? What’s the point of a parent not abusing and mistreating their child? Each parent knows that their behavior, action, and the way they treat their child effects them in many ways, so because a parent normally wants what’s best for their child they tend to try and keep a good relationship with their child, try to be a good role-models, and restrain from mistreating their child. Harris points out the significant influence of genes and peers on a child’s personality and behavior, and she believes that these influences are greater than the influence of parents. While genes and peers do have a great effect on a child, there is no evidence that proves any of these three influences (peers, parents, and genes) are more influential than the other. Parents are generally the only people who are around their children during the first few years of their lives, which are considered the most influential years of a child’s life when it comes to early behavior, so someone could easilyShow MoreRelatedPersonality Development of Children: Who Matters More?1681 Words   |  7 PagesPersonality development of children: Who Matters More? Judith Harris and John Bowlby The impact of parents on child development has been a major matter among developmental psychologists who have been trying to find a direct link between parental activities and the personality development of children. 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