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

Electricity Coursework.

Extracts from this document...


Jonny Green 10GU                                                                              

Electricity Coursework


      For my coursework in electricity we have been given the task to investigate and experiment with circuits. We need to investigate the rates at which resistance increases. I have decided that I am going to investigate the different lengths of copper wire and find out what lengths increase or decrease the rates. My aim is to find the best length of wire to produce the highest resistance which will make the highest current.

What Is Resistance?

Resistance is where there is a component or components that resist the flow of current through them. Resistance increases when a current that flows. Resistance is a measurement of how difficult it is to get a current through a component at particular potential differences or at particular voltages. This is how you work it out-

potential difference (volt, V) = current (amps, A) x resistance (Ohm)

How Is The Resistance Measured?

The resistance of a length of wire has to be done by calculating the current and voltage. I must measure the voltage across the wire (in parallel) and the current present in the circuit (in series). These measurements are then made into a formula to work out the sum. This is what it looks like-

voltage (V) = current (I) + resistance (R)

This is what is called Ohm’s Law.

...read more.


As the length increases, the resistance increasesAs cross, sectional area increases, the resistance decreasesCopper is a good conductor and is used for connecting wiresAs temperature increases, the resistance of a wire increases

In class been discussing the best methods to increase the resistance I have learnt that the if you increase the voltage the resistance increases, as there the wire will be hotter and therefor giving off more heat. Using all this information I am going to predict that the longer the copper wire the bigger the resistance.


    When I do the experiments I will have to work with voltage which will be dangerous. In order to be protected I must wear be very careful when I’m moving the wires so have to do it in a safe place so I can concentrate. Once the voltage is on the current through the wire is going to make it very hot so I won’t be able to touch it once it’s on. To make it even safer I will keep the voltage on 3 volts. I decided not to do lengths of wire shorter than 10 centimetres because it could overheat.


This is what my set up of the equipment will look like-image02.pngimage00.png



To get the right results for my investigation I must experiment with different wire lengths to see the best result for the resistance.

...read more.



My experiments went very well, I found the right evidence to prove my prediction to be correct. I think my results were pretty accurate from looking at my graph because the pattern of results flows very well with a positive correlation. The only results that don’t really fit the pattern were the lengths 35 – 40 because it takes the flow out of the graph. I think these results are very reliable because they prove that if you increase the length of the wire you will also increase the resistance. I think that my results are reliable enough to support my conclusion as I have written about all the things that could be noticed about the results. If I did this experiment again I would like to investigate the rate at which resistance increases as you change the thickness of the wire. This would be interesting to do because it would simply follow the same rule as the lengths- the longer the wire the bigger the resistance. In my experiment I found out that the longer (bigger) the wire the higher the resistance and if there is a thicker (bigger) piece of wire it should apply the same rule as they will both have larger area’s rather than a small or thin piece of wire. As this test is very similar I would predict the same results and this could also prove the theory of lengths and thickness to have an effect on resistance increasing.

...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. `Resistance of a wire -Electricity Coursework

    V/I = constant (resistance). Where v = voltage and I = current. This means regardless of the size of the current, as long as there is no temperature change the resistance of a wire remains constant. The law is based on experiment (empirical)

  2. Resistance Coursework

    All these factors must be kept constant to make the investigation fair. The same apparatus must be used throughout the investigation. It is also important to take three repeat readings and find the mean so if one result is very inaccurate, the others will average it out.

  1. Free essay

    Physics Coursework

    I will repeat this experiment a further two times. 5. I will repeat steps 2-4 for each length of wire. Fair Test In order to make sure that my experiment is a fair test I will take certain precautions: * Don't leave the power pack on * Use a

  2. Investigate the factors That Affect the Flow of Electricity Through a Conductor.

    This happens because as the metal wire of the circuit, or the conductor heat up the positive ions oscillate faster. They therefore cause electrons to lose more energy when they collide with the ions, meaning the electrons flow more slowly, causing the resistance to increase and the current to decrease.

  1. Resistance Coursework

    o I noticed that the voltage changed each time we changed the lengths, so to make it fair I will use a variable resistor in my investigation. This will allow me to adjust the voltage to 1. o I will also use sellotape to make sure the wire stay straight along the wire so that the length is correct.

  2. Physics Coursework

    We however have access to cheap but accurate digital multimeters, which can measure to this degree accurately anyway and it is then possible to measure either potential difference or current. Both circuits would deliver results. However, my concern, which I shared with my teacher, is that the Wheatstone bridge is

  1. Physics Coursework Gravity Investigation

    In doing my preliminary experiment, the golf ball proved to be the most constant when bounced. I found the golf ball to be the most constant as the other balls had irregularities and further problems affecting the accuracy of the investigation.

  2. In this project I will investigate factors that effect resistance. But to first understand ...

    have to travel a greater distance therefore they experience more opposition to their movement as they are in a longer wire and electrons collide with more atoms as there are more atoms so there is more collisions and so resistance increases as length increases provided that the cross-section, temperature and material of the wire remain same.

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