How the area of a wire affects the resistance in a circuit Essay Example for Free

How the area of a wire affects the resistance in a circuit Essay Electricity is conducted through a conductor. Resistance is the word used to describe the opposition between forces. The more free electrons there are, the better the conduction and the worse the resistance is. The more atoms vibrate, the more resistance there is. The free electrons are given energy, as a result they move and collide with the surrounding electrons. This happen throughout the whole wire. This is how the electricity is conducted. Resistance is the result of energy loss in form of heat. How do we measure it? V=I/R V=Voltage I =Current R=Resistance Ohms Law. This law states that the current through a metallic conductor (wire) at a constant temperature is proportional to the potential difference (Voltage). Therefore the Voltage and Current is constant. If the resistance increases the temperature increases, so it stays constant. At higher temperatures the particles move more quickly, increasing the collision of the free electrons. Possible Input Variables Wire area Wire thickness Wire length Applied voltage Material Taught connections Cross-sectional shape Insulated Density of wire Coiled or not Temperature Preliminary Experiments. Easy to measure? Easy to change Wire area V V Wire thickness X X Wire length V V Applied voltage V V Material X V Taught connections X X Cross-sectional shape X X Insulated X V Density of wire V X Coiled or not V V Temperature V V Applied I or V by a double cell which is measured by digital volt and ammeter. I will find out the Resistance by the formula using R=V/I. Wire area. It is difficult to change the area. A possible solution would be to add wires and twist them together. Coiled or not? It has not got an obvious affect. The Voltage and Current didnt increase or decrease. Temperature. My idea was to set up a water bath to keep the wire at a same temperature at every point. I would experiment with temperatures from 20? C-100 (room temperature to the boiling point of water) Wire length. Is very easy to set up. There is a very large range of results. Chosen Input variable I chose wire area as my variable because it is has a better variety of results. I will have 8 wires with the same cross sectional area. It would be to expensive using different cross sectional sizes of wire. I will put the wire parallel to each other an twist them add the end to increase the area of the wire. My chosen output variable is resistance because that is what I am looking for in the wire. Fair Test In the experiment I am not going to change anything ( wire length and applied voltage). The only thing I will change is the area of the wire (input variable). I will use the same equipment throughout the test, to make sure it is a fair test. If I would use different equipment it may give me different readings. I am using a safety resistor, so that the current is the same and that the wire will not overheat. It would not be a fair test if the wire would heat because it would give my different sets of results at different temperatures. It could also be a safety hazard if the wire overheats. Method Cut eight wires of the same cross sectional area in 35cm length (only 30cm of wire measured because I have to attach crocodile clips on each side   The equipment is as following: 2 cell Battery Ammeter+ Voltmeter Safety Resistor 8 wires (35cm) 2 crocodile clips   My circuit will look as following:   Let electricity pass through the circuit and note down the readings of the ammeter and voltmeter. Add more wires to the circuit and continue as planned   Make three sets of results through an accurate experiment Prediction I will expect that if the area of the wire increases the resistance will decrease. This can be proven by background physics of the past. Observation Test Results Nr. of wires   This graph shows the voltages I measured Nr. of wires This graph shows the Current I measured Nr. of wires R1 R2 R3 Rave Area m^2 1/Area   This graph shows me the resistance and resistance average I have worked out. It also includes the formulas for the Area and 1/Area My Graphs are on a separate sheet of graph paper. Analysis My graph shows me that if I increase the area the resistance decreases. I have plotted two graphs to give me a wider range of results and averages in different areas (1/Area and Area m^2). My Area graph looks like a y =1/X graph X Y 1 1 2 0. 5 3 0. 333 4 0. 25 To reassure this I have plotted an average 1/Area. If it is correct then I should get a straight line. When I plotted the graph I had a straight line. This tells me that the average is proportional to 1/Area i. e. Rave ? 1/Area. The slope is: y/x= 10. 5/16= 0. 66 ? /mi I am ignoring the offset on my 1/Area graph This experiment shows me that resistance is definitely affected by the area of the wire. Looking at my background physics it has worked out like resistors on a parallel circuit. When attaching another wire to the experiment it acts like adding another parallel resistor in a parallel circuit. So if the area of the wire increases the resistance decreases. Also I have learned if the voltage goes down the resistance goes up Evaluation I found this experiment easy to do. I had no anomalies on my graph. This means that the points I have plotted are all in a acceptable arrangement. There were no experimental caused by a faulty connection. There were no safety hazards and the experiment was safe to do.

The Other Ending To Huckleberry Finn :: essays research papers

Howling Adventures Amongst Royal Frauds After all the confusion was settled at Aunt Sally and Uncle Silas’ farm, Tom, and Jim and I decided to go down the river to the Indian Territory and go for howling adventures amongst the Injuns. So we fixed up a raft and said good-bye. A week later Tom and I ran out of money so we couldn’t buy matches or cornmeal or any of that kinder stuff. So the next town we stopped at (by the name of Hicksville), the rain was pouring down so hard and the wind was a’ howling and whooping and the thunder made you jump right out of yur’ pants, we tied up the raft and found a good dry place to put Jim and keep ‘m hid (right under the dock where the platform reaches the land). Tom and I started to walk up towards the town and he told me about this book he read. It was about two boys who ran out of money whilst traveling down a river so they decide to sell rocks to people telling them that they’re magic. I got the feeling that Tom was trying to come up with ideas to make some money. So I says â€Å"Why don’t we jest steal some money?† And for the first time Tom agreed with me. So we stole some money from a blind man and ran as fast as we possibly could to the dock. Then we almost forgot Jim so Tom ran up to the end of the dock; went under it and told Jim it was all right to come out; we headed down the river, again. As we got further and further down the river, we realized we were in the Indian Territory. We tied up the raft on a tree that had falled down across the river. We set up a lean-to and cut some firewood, and put it in a dry place to keep it from the rain. After we set up camp, Tom and I took our rifles and decided to go hunting. We caught ourselves a rabbit and figer’d we best get back to camp before it got too late. When we got back to camp the lean-to was destroyed and Jim was gone. Well, it started to rain again and it was getting darker by the second. Tom looked over at me and said, â€Å"Injuns!† â€Å"I don’t know.† says I. â€Å"Do you have a plan, Tom?† â€Å"A plan for what?

Interpret Marketing Trends and Developments Essay

The aim of this report is to determine if potential alternative hub airports to service the growing of Australasian and Pacific markets by researching and identifying considerable inroads into this large market for expanding and growing opportunities for Virgin Australia’s potential abilities Methods Used A questionnaire (Appendix 1) was distributed to students attending Metropolitan South Institute of Tafe (MSIT) as well other data conducted to research preliminary and secondary data from the Tourism Australia market profile. As well as conducting Risk Analysis from other countries in the Pacific and Australasian countries, which includes airlines and traveller statistics and performances. When undertaking the questionnaires, the data was distributed and collated by answering question on what students preferred as their haul destinations. As a result the analysis was conducted that most of the students preferred Fiji in category 1 while category 2 the students preferred Malaysia that has the highest percentage of students followed by Vietnam and Philippines as their hub destination. Students preferred its natural beauties of its countries rather that its infrastructure, and rich heritage. As well as its scenic views and luckily 23 students have travelled internationally while 4 students said they never travelled at all. From the students conducted in this questionnaire students were around 21 to 30 years old more than the rest of the respondents in this demographic. Sources Other than the questionnaire, this report did not use any other sources but analysing a risk matrix of countries whether the profile status was able to be a hub destination or not. Scope This report looks at the opinions of students attending MSIT Mt Gravatt, and investigations of countries in the Pacific and Australasian regions for strategies to conduct major airlines services. Background From this report it will be investigated by the following elements of regional analysis in Australasia and the Pacific. It will also look at the trends from the landscape of aviation analysis and the main key airlines that each countries support on using as its carrier. Demographics will also be analysed by the market performance of the country in each category and its destination ports and statistics. Establishing a performance on its international routes will be the key priority in building successful and stronger platforms for the future.

Pantheon And The Gods - 1338 Words

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