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

Investigation on how a length of a wire affects the resistance in a current.

Extracts from this document...

Introduction

GCSE Physics Coursework Year 11 Craig Lochhead Investigation on how a length of a wire affects the resistance in a current Aim The aim of this investigation is to show how the length of a constantan wire will affect the resistance of the current going through the wire. Prediction I would think that when the length of the wire increases the resistance in current will increase as well. I think that the increase of the resistance is directly proportional to the length of the wire. Background Information The meaning of resistance in a circuit is how much a voltage is needed to push a current through a wire. There are factors that affect the rate of resistance of a current. These factors are length of wire, area of a wire (diameter), material used and temperature. The cross-sectional area of a wire can affect the rate of resistance. As a wire in area increases the resistance decreases. This is because there is more space for the current to go through. The material used can also affect the rate of resistance in a current going through a wire. The material used for the least resistance is Copper. This is because there is a lot of space in between the atoms of the metal, making it easier for the current to pass through. ...read more.

Middle

* Readings are then taken when the length of the constantan wire is at 10cm, 20cm, 30cm, 40cm, 50cm, 60cm, 70cm, 80cm, 90cm, and 100cm. Using the results gathered from this experiment, the resistance of the specific length of wire can then be calculated. Resistance and be calculated using Ohm's Law, which is shown below. V= I x R or Voltage (Volts) = Current (Amps) x Resistance (Ohms) Fair Test Since there are four other types of factors that can affect the rate of resistance, these parameters in the experiment should be set up carefully so that it does not affect the rate of resistance. In this experiment the length of the wire will change from 0 to 100 and it should be made so that the length required for the results are accurately measured. All other factors of resistivity must not be changed as they will affect the rate of resistance. I must make sure that the voltage and the current of the wire must not be changed either as this can affect the rate of resistance as well. Room temperature must remain constant as well. Results Table Length of Wire 1 2 3 Average Resistance (cm) V I V I V I V I (ohms) ...read more.

Conclusion

Evaluation In the graph I have shown there is only one anomalous result, this could just mean that I have done a simple mistake while measuring the lengths required. Although I think this result is anomalous it is not far of the line of best fit. To improve my results a bit more to make it more reliable I could make more testing so that my average is better. Even though the wire should be at the same diameter at all points, there still could be different diameters to some areas that could affect the results I had. Another factor that could have changed or did change my results is when I measured the wire and put in place as the wire was bent and I didn't straighten it. Also the wire was not properly placed on the ruler as it was only celotaped on. I could also have expanded my investigation further by testing the other parameters involved in this investigation. I could have tested different type of materials to find out what resistance went through them at a constant length. This would be done to see which material had the least resistance and the most resistance. I could have also tested the different diameters using the same metal to test how resistance is affected when using different lengths. ...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. Resistance of a Wire Investigation

    or not the intensity of light would affect the rate of photosynthesis in a plant. To do this, I placed a piece of Canadian pondweed in varying light intensities, and observed the amount of oxygen being given off. I used Canadian pondweed because of its unusual quality of giving off

  2. An in Investigation into the Resistance of a Wire.

    The experiment investigating in the length of a wire is shown in the preliminary experiment. Ohm's law actually states that the current flowing through the circuit is directly proportional to the applied voltage (if you double one, you double the other).

  1. An Investigation into how the Length of the wire affects its resistance

    looks like it is evidently too hot, I will switch off the current for a while so that it can cool down. Fair Test: Ensuring that the experiment is a fair test is important because otherwise the results will not be accurate.

  2. Investigate how mass affects the diameter of an impact crater.

    The drag depends on its shape and area. Hence the flat curve demonstrates the point at which terminal velocity has been reached. In order to validate that crater size is proportional to the square root of mass I will produce a line graph showing the relationship between two.

  1. Investigating how the length of a Wire affects its resistance.

    This is because the Ammeter is needed (as explained subsequently) for use in the circuit anyway. The resistance will be calculated using the equation V=IR which can be re-arranged to give (Ecq4) R=__V__ I The variable resistor or rheostat will be added so that current in the circuit can be kept constant.

  2. Resistance in a Wire Investigation

    0.68 2.26 Observations Observations: we will observe the reading on the voltmeter change as we change the current to .3 A. we also observe a general increase in the voltage as the length of wire we use gets longer. The rheostat will also be set at different positions for the different lengths of wire that we use.

  1. To investigate how the length (mm) and the cross-sectional (mm2) area of a wire ...

    A z V z A z V z A z V 20 mm x A x V x A x V x ? x A x V x A x V x ? x A x V x A x V x ?

  2. The aim of this investigation is to discover how the length of a wire ...

    Preliminary Experiment I carried out a preliminary experiment to help me with my predictions, and also to help illustrate any flaws in the method, and to make sure I would get an accurate set of results for the main investigation.

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