• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month
Page
  1. 1
    1
  2. 2
    2
  3. 3
    3
  4. 4
    4
  5. 5
    5
  6. 6
    6
  7. 7
    7
  8. 8
    8
  9. 9
    9
  10. 10
    10
  11. 11
    11
  12. 12
    12

Physics coursework- Investigating the resistance of a wire.

Extracts from this document...

Introduction

Physics coursework- Investigating the resistance of a wire.

Resistance is measured in ohms. Ohms law states that the current flowing in a conductor is proportional to the potential difference between its ends. It is usually written as V = IR, where V is the potential difference, or voltage, I is the current, and R is the resistance of the conductor.

V

        I

V        

        I

Electrical resistance is a force or material which opposes the flow of electrical current around a circuit so that energy is required to push the charged particles around the circuit. Electrical resistance has been measured in “ohms”.

Electricity is basically a flow of electrons. In the case of electrical current, the atoms in the structure of a conductive material either allow or block the flow of electrons. Poor conductivity means that the atoms are arranged so that they block, or resist the flow of electrons.

Resistance of a conductor =  

                                             R =

The wires which the electrons travel through vary from different lengths and widths.

When the wire is thin, there are lots of atoms for the electrical current to pass so there is a large resistance.

...read more.

Middle

  • Plot the results that you got for the voltage and current in a table and put the average.
  • Repeat five times
  • Repeat above using the other three wires

Safety precautions

We made sure we had our hair tied up when do the experiment in case our hair got caught in the wire and burned. We also did the same with our ties, tucking them under our jumpers in case they also come in contact with the wire.

We thought that this method was a much better way than in our preliminary experiment because in our first attempts, we measured at every 10 cm and only used one type of wire. This caused us to have unreliable results and not having a big difference in the numbers too. Using these new numbers to measure the wire with gave us a big difference in numbers in our results and made them more reliable. Furthermore, using copper, constantan, manganese and nickel chrome made a real difference in our results as we could see how the thickness of the wire affected the resistance.

We used four different lengths of wires:

  • Copper
  • Constantan
  • Manganese
  • Nickel chrome

We decided to do five repeats of each length of wire.

...read more.

Conclusion

I think my method worked quite well but if I could redo my method again, I would change it a little bit. I found that in our method we got much more results and for each length of wire, the measurements were closely the same. What I found was that for the wires nickel chrome and manganese, the average went very high by the time we got to 90 cm whereas the wires copper and constantan were quite low. So instead of measuring at 90 cm, we could have gone slightly lower down. We made sure our hair was tied up and our ties were tucked in throughout the experiments.

We don't need to improve our equipment list because the equipment alone itself worked quite effectively.

I think that my data is accurate and reliable because we did five repeats of each wire meaning that we get more results and data which will make us be able to outline any outliers and will help to prove my question that I am investigating.

Further data which could be collected to improve the reliability of my results are a bigger range of materials and lengths so this way we would get even more results and this would make everything even more reliable.

...read more.

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. Marked by a teacher

    Draw stress and strain graphs for the metal copper and the alloy constantan. Calculate ...

    4 star(s)

    The G-clamp and pulley will also be clamped to the table at this time, pulley at the end of the table and G-clamp at approximately 2 metres from the pulley (as shown in Figure 1) 5. Set up wooden bridges at ten centimetres from the G-clamp and collect copper wire

  2. GCSE Physics Coursework - Resistance of a Wire Coursework

    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.

  1. GCSE Physics Coursework - Resistance of a Wire Coursework

    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. Resistivity in a wire coursework

    After that, I will slowly increase the voltage and continue to record the readings. Once I've got at least 6 readings for one wire, I will repeat this with a different piece of wire that has a different thickness until I have 5 different sets of data.

  1. Resistance of wires

    The logical explanation for this conclusion is straightforward and is really uncomplicated. Anybody should be able to get the picture of this hypothesis and should not be confusing as the explanation is very practical. Hypothesis ~ The straightforward explanation for the increase of resistance being proportional to the length of wire it affects is like a water system.

  2. Resistance and Wires

    The range bars, shown on the graph show how accurate the results are. A smaller range bar indicates a very high degree of accuracy; however a larger range bar indicates a low degree of accuracy. As shown on the key, on the graph, the highest line on the range bar

  1. Physics Coursework

    0.209 0.245 78.0 0.196 0.229 80.0 0.188 0.218 Random Measurements I heated the water using the normal apparatus in the standard way. Using Calibration curve 2 (reasoning explained later) I was able to use the voltage read out to work out the temperature of the water.

  2. Resistance of a wire - PHYSICS COURSEWORK GCSE

    The column headings will be as follows: 'Length of Wire', 'Voltage', and 'Amps'. Having completed the experiment I will repeat it so that my results can be averaged out to get more accurate results and try to eliminate any anomalies.

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