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

Resistance of a Wire

Extracts from this document...


Background scientific knowledge


Electricity is the movement of charge (electrons) around a circuit. The charge flows throw conductors which allow the electrons to pass through. An object which does not allow electrons to pass through is an insulator.

Conductors intended to have resistance are called resistors (symbol            )image04.png

Voltage- given the symbol V, measured in volts using a voltmeter

Current- given the symbol I, measured in Amperes using an ammeter  

Metallic structure diagramimage05.jpg



Resistance is the ability to prevent or resist the flow of electrical current. Resistance occurs in an electrical circuit because of a collision between electrons and atoms, which slows the electrons down and converts some of their KE to heat energy. Resistance is measured in Ohms (Ω).


Arrow shows direction of electron movement through the wire.




Factors which affect resistance

Length of wire – this is being investigated
Thickness of a wire

...read more.




Expt. No

Length of
























Graph showing length of wire against resistance






Expt. No

...read more.


The results support my prediction as there was a bigger resistance in the longer pieces of wire compared to the shorter ones which had a smaller resistance.


The evidence is reliable as I minimised the chance of the wire heating up too much as I used a switch to turn it off when I wasn’t using it. I also took repeats and an average to make sure each result was fairly the same and there weren’t any anomalies.

There were some problems in the procedure as the wire still heated up and the measurement of the wire wasn’t very accurate as there was bends and kinks in the wire.

The improvements I could make are to make sure my measuring of the wire was accurate, to use a longer length of wire and to take more averages.

I couldn’t see any anomalies in my results or on my graph.

The other variables I could investigate arethickness of a wire and material of wire.

 | Page

...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

Here's what a star student thought of this essay

4 star(s)

Response to the question

A well set out experiment for this level. The candidate outlines the scientific knowledge of resistance well and relate it to the experiment to get an accurate prediction of what will happen during their experiment and what will be ...

Read full review

Response to the question

A well set out experiment for this level. The candidate outlines the scientific knowledge of resistance well and relate it to the experiment to get an accurate prediction of what will happen during their experiment and what will be shown in their results. It is good to back any statement up with valid scientific knowledge as this shows a deeper understanding of the subject and consideration of the experiment and what the results will mean. The candidate makes an accurate evaluation of the experiment but they could include further improvements upon the problems they encountered but this is only an addition as they already provide a good range of possibilities. The conclusion is accurate based on the rest of the experiment.

Level of analysis

The candidate includes a background scientific knowledge section which is really good because it helps the reader understand that the candidate possesses all basic knowledge to make an accurate prediction about the experiment they are carrying out with solid scientific knowledge. Factors which affect resistance and why they do so are outlined well. Factors other than the one being investigated should be kept continuous so they do not bias the experiment. The candidate understands this, hence this is controlled by the candidate which shows a high level of understanding of resistance in this instance. The candidate outlines the method and how he will keep these constant, but one or two of the instructions are hard to interpret so the candidate should make this clearer to ensure the reader knows exactly what they are doing. The prediction of the candidate is good and draws on valid scientific knowledge to make a valid hypothesis.

Quality of writing

In the method punctuation is inconsistent and this should be addressed so the writing does not look 'sloppy.' Otherwise, spelling, grammar and punctuation are to a good standard. The layout of the essay is good with clear subheadings for each different section.

Did you find this review helpful? Join our team of reviewers and help other students learn

Reviewed by skatealexia 10/07/2012

Read less
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

    Investigation into Energy Released From Burning Various Alcohols.

    4 star(s)

    I will measure the temperature of the water, and record this. * I will light the spirit burner using a splint, and leave it for 30 seconds to burn and let the flame stabilise. After 30 seconds, I will place the burner under the beaker, and start a stopwatch.

  2. Marked by a teacher

    Investigation into the Physics of a Light Dependent Resistor.

    4 star(s)

    the bulbs used in the experiment emitted white light, which contains all frequencies of light. The electrons in the semi-conductor all responded to the same frequency of light (i.e the amount needed for the electron to transfer to the outer electron level.

  1. Peer reviewed

    Investigation in resistance in wires

    5 star(s)

    = 1.25 x 10^-6 ? Then I looked on various websites on the internet and found that the actual resistivity of nichrome was: 1.1 x 10^-6 ? Now if I convert these two into numbers I get: Resistivity of my wire: 0.00000125 ? Actual resistivity of nichrome wire: 0.0000011 ?

  2. To investigate which fuel gives out the most energy when burnt. We are burning ...

    It may have been due to the lid of the spirit burner not put on correctly leading to the evaporation of the alcohol or it may have just been an error in our calculations. My predicted graph and the graph showing my results are also very similar.

  1. Electromagnets - What factors affect strength of an electromagnet?

    The anomaly may also have been resulted, because the iron bar might have sided out slightly, causing the magnetic field to weaken. During both of the experiment I also observed number of things. During the first experiment I noticed that, when the power pack was switched off on a particularly

  2. Free essay

    Resistance in a wire

    This is clear as the wire extends 10cm the resistance enlarges. This is because as the length increases resistance occurs more frequently. Results for second test Voltage used 6V Thickness used 34wsg Length (cm) Voltage (v) Current (A) Resistance (ohms)

  1. To find out what happens to the efficiency of a motor as I change ...

    My graph backs up these comments. As you can see, the weights tested that were higher than 0.6N produce a clear downwards trend, showing that the efficiency of the motor decreases as the weight of its load is increased. Explaining what I have found out The first trend - why does the efficiency increase?

  2. The resistance of wire.

    the same, The edge of the crocodile clips should be at the edges measured length. The Variable factor The factor that I am going to vary is the length of the E26 wire. Circuit diagram Method The circuit was set up as shown above.

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