• 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 electrical resistance of a wire changes in relationship to its length.

Extracts from this document...


Amandeep S. Gill Science Resistance of a Wire Aim: To investigate how the electrical resistance of a wire changes in relationship to its length. Before I write about my experiment, I will recap Ohms law as I know that this has an important role in the latter stages of my experiment. I will fully mention and explain this in the Analysis and the Prediction Ohm's Law, It states that the current flowing through a component is proportional to the potential difference between its ends, providing temperature is constant Word Formula : Current = Voltage / Resistance Symbol Formula : I = V / R Equipment Used, The following is a list of the equipment that I used during this experiment and the reasons and purposes of each object: * Nichrome Wire - I used this type of wire in my experiment because it has a big resistance compared to other metals. This wire was secured on top of the ruler so that the resistance could be measured accurately. * Power- Pack - This gives the current to the wire which is connected to the circuit. * Amp- Meter - This device reads the amount of amps which is occurring from the experiment. ...read more.


Dry Hands - It is essential when dealing with electricity I keep and stick to the correct precautions, and keeping my hands dry is common sense when dealing with electricity. Reliability, To keep this experiment as accurate as possible I need to make sure, firstly, that the length of the wire is measured precisely from the inside edge of the crocodile clips, making sure that the wire is straight when I do this. I must also make sure that the wire is straight when we conduct the experiment. If it is not, short circuits may occur and bends and kinks in the wire may effect the resistance. The reading that I take of the voltage should be done fairly promptly after the circuit is connected. This is because as soon as a current is put through the wire it will get hotter and I want to test it when heat is effecting it the least, i.e. at the beginning. Results, The tables below are showing the three repeated results which I carried out during this experiment: Experiment 1, Length Voltage Current Resistance 10 4.5 6.58 0.68 20 4.5 4.55 0.99 30 4.5 3.43 1.31 40 4.5 2.85 1.58 50 4.5 2.40 1.88 60 4.5 2.07 2.17 70 4.5 1.80 2.50 80 4.5 1.61 ...read more.


Most errors in our experiment were encountered in the measuring of the wire. This is because it simply was not very practical to hold a piece of wire straight, whilst holding it next to a ruler and then trying to accurately fix crocodile clips to the right part on the wire. Also I do not feel that the crocodile clips were always fixed securely to the wire with a good connection. This also meant that they were easy to move about on the wire changing the length of it. Errors rarely occurred in the setting of the current and the reading of the voltage. It was just in the preparation area that they did occur. Another example of this is the wire was never totally straight when we started the experiment, which may also, as said earlier on, effect the resistance of it. I do not think that doing any more results in our experiment would have made it any more accurate. I feel that the only way to make it more accurate would be to use a different method - perhaps were we had a bar that did not bend in place of the wire. We could even use a rheostat in place of the wire, because it is essentially a long coiled wire that is connected at different lengths to change the resistance of the circuit ...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. Finding a material's specific heat capacity

    Cotton wool and bubblewrap are good insulators because they have many air pockets which have a very low heat conductivity. This helps to significantly slow down conduction and convection through the medium. It was made certain that the insulation was not wrapped too tightly around the beaker with the masking

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

    Fig 2. Circuit used to investigate the relationship between resistance and length of wire. Apparatus: In my investigation I will be using: * Power pack (to provide low voltage) * Variable resistor (to control size of current) * Digital and Analogue Voltmeter (to measure p.d.)

  1. To investigate how the electrical resistance of a wire changes in relationship to its ...

    The last two factors will be kept the same by using the same wire all of the way through the experiment. The current that we pass through the wire is to be kept the same, also. If this is changed the temperature of the wire might change in a way that is not constant making the results more confusing.

  2. Investigating Resistance in an electrical circuit

    Voltage (Volts) Current (Amps) Resistance (Ohms) 100 1.7 0.38 4.47 95 1.7 0.39 4.36 90 1.66 0.4 4.15 85 1.66 0.42 3.95 80 1.62 0.44 3.68 75 1.58 0.46 3.43 70 1.55 0.48 3.23 65 1.5 0.5 3 60 1.46 0.52 2.81 55 1.4 0.55 2.55 50 1.35 0.58 2.33 45 1.2

  1. Determine how the effect of electrical resistance changes with varied length of a metal ...

    Conclusion In conclusion, this experiment showed that the thin wire provided the largest resistance, due to the fact that there is limited room for the electrons to flow through, resulting in more collisions occurring between electrons and other atoms within the wire, resulting in the atoms of the wire to vibrate more.

  2. Investigation into the effect of length of wire on electrical resistance

    METHOD The following circuit was constructed to perform the investigation: The two dots represent the crocodile clips that were placed at the ends of the required length of wire. 1. One metre length of 0.4mm diameter "constantan" (a metal alloy)

  1. To investigate how the resistance of a wire changes.

    Readings I shall take & how many? * Length: I will take 10 readings of length. 10, 20, 30, 40, 50, 60, 70, 80, 90 and 100cm on a table. * Voltage: I will take 10 readings of voltage. To measure to amount of push and put it on a table * Current: I will take 10

  2. Investigate how the electrical resistance of a wire changes in relation to its length.

    In this experiment a metal wire (Nichrome will be the conductor). So when resistance is high, conductivity is low. Metals such as Nichrome conduct electricity well because the atoms in them do not hold on to their electrons very well.

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