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

To investigate how the resistance of a wire is affected by changing the length of a wire.

Extracts from this document...


Physics coursework. Aim:- To investigate how the resistance of a wire is affected by changing the length of a wire. Resistance is the force, which stops the flow of an electrical current around a circuit so that energy is required to push the charged particles around a circuit. Resistance occurs when the electrons travelling along the wire collide with the atoms of the wire. These collisions slow down the flow of electrons causing resistance. Resistance is a measure of how hard it is to move the electrons through the wire. Resistance is affected by a number of things, these are: Temperature: because if the wire is heated up the atoms in the wire will start to vibrate more because of the increase in energy. This causes more collisions between the electrons and the atoms as the atoms are moving into the path of the electrons. This means that there will be an increase in resistance. Material or type: Firstly the material you use must be a conductor or no electricity will flow at all. W will be using a metal wire to measure what affects its resistance. But there are different types of wire. ...read more.


To prevent it from affecting the experiments accuracy. The only thing that will be changed is the length of the wire. I chose this as my variable because after researching into the factors that affect resistance. I thought that this would be the easiest to make sure it was accurate and would draw the most conclusive results. I decided that to be able to draw a clear conclusion from my results I would need to do a maximum of 10 experiments and a minimum of 6. We were given a length of wire a meter long, as the longest length of wire we could use. We then divided it up so that we would be taking 10 readings at: 10cm, 20cm, 30cm, 40cm, 50cm, 60m, 70cm, 80cm, 90cm, 100cm. I then needed to decide what voltage would give us the most accurate results and which type of wire to use. So I decided to carry out preliminary experiments in order to make the decision. The preliminary experiments would also help me to familiarise myself further with the method, and if I came across any problems I could correct them. I would them be able to obtain precise and reliable results in my main experiment without any of these difficulties. ...read more.


I predict that as I increase the length of wire the resistance will also increase. I predict this because I know that if you increase the distance the electrons must travel. You in turn increase the chance of more collisions occurring. Meaning that there will be a greater resistance. I also predict that the increase in resistance will be directly proportional to the increase in wire length. I predict this because I think that if you double the wire length you will double the resistance. If the length of wire increase and the resistance increase are directly proportional. I predict my graph will look like the one below. Resistance Wire length Results Results for experiment 1 Results for experiment 2 Length in (cm)_ Voltage Current Resistance Voltage Current Resistance 10 0.58 7.35 0.08 0.37 8.5 0.04 20 0.73 6.3 0.12 0.72 6.7 0.11 30 0.92 5.2 0.18 0.87 6.1 0.14 40 0.99 5 0.2 0.97 5.6 0.17 50 1.03 4.51 0.23 0.99 5 0.2 60 1.17 4.5 0.26 1.13 4.6 0.25 70 1.22 3.92 0.31 1.14 4.4 0.26 80 1.21 3.9 0.31 1.22 4.3 0.29 90 1.32 3.69 0.36 1.26 3.8 0.33 100 1.41 3.3 0.43 0.99 5 0.2 length in (cm) average resistance 10 0.06 20 0.12 30 0.16 40 0.19 50 0.22 60 0.26 70 0.29 80 0.3 90 0.35 100 0.32 ...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. How does length and width affect resistance

    The longer the wires, the more bent the wires were and the more inaccurate the results would be. This is the reason for using pieces of metal wire, which are 50cm long, in the method. In this experiment I went up in 20 gauge intervals and did realised that this

  2. Investigate how the resistance of a wire is affected by the length of the ...

    The equations are: V = I * R R = V / I I = V / R Where V = Voltage I = Current R = Resistance Ohm's law states that the current through a metallic conductor is

  1. To Investigate the Relationship between the Resistance and the Length of a Wire

    A plot of voltage against current for the nichrome wire is shown in Graph 1, and produces an approximate straight line. This shows that V � I is constant and the nichrome wire obeys Ohm's law. Table 1a Results from Pilot Experiment 1: Manganin: 12.0 cm 30swg (0.31mm)

  2. Investigate how the electrical resistance of a wire is affected in relationship to its ...

    to pass through the wire than they do in order to be able to pass through a short wire. 3) Type of material Different materials have different resistances because the materials' atomic structures are different so some metals have low resistances and some have high resistances.

  1. Investigating the Resistance of a Wire when Changing the Length.

    Below is a diagram is what I plan the experiment to look like: I predict that as the length of the wire goes up, the resistance will also go up. I predict this because the longer the wire is, the more atoms that the electron will have to pass by and avoid.

  2. To investigate how the resistance of a wire is affected by the length of ...

    This so-called force is called the electromotive force, or emf. The SI unit for the emf is a volt (and thus this is not really a force, despite its name). We will use a script E, the symbol, to represent the emf.

  1. To investigate how the resistance of a wire is affected by the length of ...

    Therefore, more energy is going to be lost in these collisions (as heat). * Furthermore, doubling the length of the wire will result in double the resistance. This is because by doubling the length of the wire one is also doubling the collisions that will occur, thus doubling the amount of energy lost in these collisions.

  2. How resistance is affected by changing the length of a Wire.

    If the material has a high number of atoms there will be high number of electrons causing a lower resistance because of the increase in the number of electrons. Also if the atoms in the material are closely packed then the electrons will have more frequent collisions and the resistance will increase.

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