• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

To carry out the investigation, I am going to use various thicknesses of wires. These will be secured to a ruler

Extracts from this document...

Introduction

Physics coursework I am going to do an investigation into the resistance of a wire when various currents are passed through it. There are many things that could effect the resistance of the wire we are going to use, these include; Material the wire is made from Temperature of the wire at the time the reading is made The length of the wire The diameter of the wire The material of the wire can affect the resistance because various materials conduct electricity better than others, if the wire were made out of an insulating material such as plastic there would be a very high resistance through the wire. Whereas if the wire were made out of a metal, the electricity would pass through the wire with great ease. Temperature effects the resistance of a wire, this is because if the wire hot when the current is passed through it, the particles will have more energy in them. This means that they will be moving more, and at a greater rate than if they were cold. This means that they will pass the charge on to the next particle easier. Electricity has to move from atom to atom along the wire, which means that if we double the length of the wire, we would need to double the current. ...read more.

Middle

Prediction I predict that the smaller thickness of wires will have a greater resistance than the larger ones, this is because as the thickness of the wire increases, there is a larger amount of space in which the electrical current can travel. Meaning that the atoms will not be as close together as in a smaller wire. The largest thickness of wire will have the smallest resistance. I also predict that as the length of wire increases, the resistance will also increase. The electrical current has to be passed along from atom to atom. If there is a larger amount of atoms present in the wire lengthways, then the current will have to pass through a larger amount of atoms. This means that the resistance of the wire will increase. If the length of the wire is doubled, the resistance across that wire will also double. If the temperature of the wire were to be increased, the resistance would also increased. This is because heat energy causes atoms to vibrate more often, these vibrating atoms disturb the movement of the electrical current therefore a higher temperature would cause an increase in resistance. 0.31 mm Length (cm) 20 40 60 80 100 Voltage 0.38 0.76 1.16 1.6 1.96 Current 0.3 0.3 0.3 0.3 0.3 Resistance 1.27 2.5 3.9 5.3 6.5 Voltage 0.5 1.03 1.51 2.02 2.55 Current 0.4 0.4 ...read more.

Conclusion

This was again due to the amount of atoms the electricity had to pass through before reaching the end of the wire. All three thickness show that the length of the wire affects the resistance. The results also show another part of my prediction to be correct, as the thickness of the wire is decreased, the resistance through it increases. This is because in a thicker wire, the electrical charge is more spread out than in a smaller one, therefore the resistance of that wire will be smaller than a wire where the charge is in a smaller space. If I were to repeat the experiment, there are two things that I would change. I would alter the way in which the length of the wire was measured. By using the crocodile clips to alter the length of the wire used, it was possible for an error to be made. At times the crocodile clips slipped across the wire, meaning that the wire had to be constantly watched to ensure that the correct length of wire was being measured. The second thing that I would change if the experiment was repeated is the thickness of the wires used. I would use more wires, with larger differences between the thickness of them. This will ensure that the results we receive are reliable. Also by using more wires we are making sure that the results we end up with are more representative of the actual experiment. ...read more.

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.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Electricity and Magnetism essays

  1. Peer reviewed

    Investigation in resistance in wires

    5 star(s)

    The wire length of 25cm was retested as you can see on my table of results because it had a large amount of outliers the other possible outliers are highlighted as well. As you can see most of the outliers were together with others not just randomly, this leads me

  2. Resistance of a Wire Investigation

    In this case, as long as the experiment is done over a short period of time, the amount of carbon dioxide used up by the plant will not be sufficient enough to cause the carbon dioxide concentration to become the limiting factor.

  1. Investigate the resistance of different wires and how at different lengths the voltage increases ...

    My graph does not match the theory 100%. Relating my evidence to that in my prediction and scientific knowledge In my prediction I said that the resistance will be proportional to the length of the wire. My graph proves my prediction to be more or less correct. It shows a positive correlation which means that as the length increases, the resistance increases aswell.

  2. Resistance and Wires

    This was necessary to give an accurate reading of current. The voltmeter was used in parallel because I was measuring potential difference. The voltmeter measured the potential difference of the area of which it was in parallel with. Due to the fact that this experiment involves a long wire, I chose to use 10v DC in the circuit.

  1. Resistance in a Wire Investigation

    Apparatus For this investigation I will need several pieces of apparatus, these are as follows: 1) A ruler (to measure the length of the piece of wire that is being used). 2) Wires (to connect the circuit together) 3) A voltmeter (to measure the voltage in the circuit.

  2. Resistance Investigation

    Also in this investigation I will be using a power pack, and I will set the voltage to 4 volts. If I chose the maximum of 12 volts, it would burn out the complete circuit, as well as this there would be a temperature increase.

  1. Resistance of wires

    Difference of resistance in different metals depends how many free electrons the material contains. A lesser amount of energy will be needed for the flow of electrons if there are more free electrons in the wire. As we (at our level of studies)

  2. Resistance of Wires.

    Provided the temperature of the wire does not change, the resistance should be the same for each reading at the same voltage and length of wire. This is the circuit I will use: I will 32swg copper wire. - The thickness of the wire and type of wire shall be kept constant.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work