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To investigate the factors present in a wire (and the circuit that it is connected to) which affect the ability of current to flow through it.

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Introduction

HOW DO FACTORS PRESENT IN A WIRE AFFECT ITS CURRENT? PHYSICS COURSEWORK- OCTOBER 01 BY LISA NIGHTINGALE AIM- To investigate the factors present in a wire (and the circuit that it is connected to) which affect the ability of current to flow through it. PREDICTION- There are many factors present both in a wire and its circuit which would affect the current in the wire: FACTOR HOW DOES IT AFFECT THE CURRENT? HOW CAN YOU CONTROL IT? Thickness (diameter) Allows more/less current to pass through the wire in a space of time. The thicker a wire, the more options there is for the current to flow easier, than with a thinner wire. Using the equipment available, there is no means of controlling the wire's diameter this is because we have to use the same wire throughout the experiments, for the whole investigation. Conductivity And Density (material) Allows easy/ hard passage through the wire. Different materials have different conductivities. This is dependent on their densities. The more dense a material is, the less well it will conduct electricity. This is because there is less room for electrons to move and current to continue flowing. There is a choice of using two metals, ni-chrome, and constantan. These are both of different densities and the density of each remains constant during the experiment so it does not need to be controlled manually. ...read more.

Middle

This is because the resistance increases (at a steady rate) but the voltage remains constant. The graph should curve because it is a 1/x graph. The resistance- length graph should be a straight line of negative correlation. It will be straight because the resistance is directly proportional to the length of the wire, and will also pass through the origin. The resistance increases with the length, and also increases at the same rate throughout. The graph should not curve because it is a 1=x graph. Another reason as to why the resistance should increase is because there are atoms present in wires. The longer the wire, the more atoms there are present in it. Therefore there are more obstacles in the wire for the electrons to be obstructed by. This will "slow" the electrons down, or offer increased resistance. I can also use a model to show how the current would flow differently through different lengths of wire. I will use the model of people walking through a corridor. The corridor width remains constant. If a corridor were short, then people would be able to walk through it quickly. There would be no pushing from others, and it would be fairly simple. As the corridor increases in length, so does its capacity. It can hold more people; so more people enter it. It is more crowded so becomes harder to pass through. ...read more.

Conclusion

APPARATUS- * Power pack * Ni-chrome wire, attached to a wooden block * 2x crocodile clips * Ammeter * Voltmeter * Variable resistor * 6x wires * Screw-gauge micrometer * Ruler DIAGRAM- METHOD- 1. Set up the apparatus as shown in the diagram above. Make sure that the voltmeter is connected in parallel to the circuit, and the ammeter in series. 2. Measure out 50mm intervals along the wooden block that the experiment wire is attached to until 500mm has been measured. 3. Measure all variables as stated in the prediction and fair test sections to ensure that they are constant. Follow the methods stated previously clearly to ensure that this is done accurately. 4. Set the voltage of the circuit at 0.40 . 5. Place one crocodile clip at the point marked "0" on the piece of wood. Place the other 50mm away. Take three readings from the ammeter, taking care to turn the power pack off and on again between each reading to prevent the wire from heating. 6. Repeat this 9 times, at each 50mm interval, continuing until three readings are taken at the 450mm mark. 7. Put the results into a table and work out the average current at each length (50-450mm) of wire. 8. Draw a graph of results. RESULTS- Type & Avg. diameter of wire Length of wire (mm) Voltage Current 1 Current 2 Current 3 Avg. Resistance V/I Resistance pL/A ?? ?? ?? ?? Lisa Nightingale 11aT ...read more.

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