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

Investigation to show how the physical factors of a wire affect its resistance.

Extracts from this document...


Investigation to show how the physical factors of a wire affect its resistance Aim To figure out how the length of a wire affects the resistance of current flow through a constantan wire. Prediction I am doing an experiment to investigate how the length of a wire in a complete circuit affects the current, voltage and resistance. The current in the circuit should decrease as the length of wire increases. This is simply because the circuit is longer so the current spreads and there are more chances of collisions with atoms in the wire. The voltage should stay the same throughout all of the experiments because the power does not change. In theory, the resistance should increase as the length of wire increases. This is because in a shorter wire the current can flow through the wire easier. There are more chances of collisions with atoms in the wire in a longer wire, which will reduce the flow of electrons. Therefore I predict that as the length of wire I use from the wire-board gets longer, the resistance will increase. I also think that if the length of wire doubles, the number of ohms will also double. ...read more.


One will be current against length and the other will be resistance against length. This will hopefully help me find out how the length of the wire affects the current and resistance of the wire. Improving Accuracy and Fair Test To improve accuracy and keep it a fair test I will firstly keep the power pack turned on for as short as possible. This is to stop heat affecting the results by warming up the wires and possibly reducing the resistance. I will also keep the power pack switched on to 2V to keep the temperature as low as possible and keep it on Dc to prevent any electric shocks. I will also ensure all crocodile clips and connections are secured to prevent current loss. When reading the voltmeter and ammeter I will round the digits up to 2 decimal places to make sure the average is as accurate as possible. To keep it a fair test I will only change 1 variable, the length of wire. Repeating the experiment 3 times and working out the average is also a way of keeping the experiment fair. Preliminary Work Before doing the experiment I am doing some preliminary work to see if everything works and get an idea of the range of lengths of wires to use. ...read more.


In future to prevent any loose connections of wires I would thoroughly check every connection by using a bulb as a tester. This would also work to check whether the equipment is working correctly. It is fine for me to say my experiment went well but I need to check somebody else's results to see whether they are similar to mine. This group's results were using exactly the same factors as me so I can compare the results better. Their results seem to go in the same direction of mine, proving that resistance in a wire increases with the length. However, the theory that as the length of wire doubles so does the resistance is not so clear with their work. For example, at 20cm the resistance was 0.43 and at 40cm it was 0.75. This is not far off but the difference between that of 10 and 20cm is. The resistance does not change. There is obviously something very wrong here as it is supposedly meant to double. This could be a loose connection or faulty wire that has been fixed later on. Compared to this groups results, my experiment ran smoothly and it shows that every experiment cannot run perfectly every time. ...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. Marked by a teacher

    Resistance Aim: my main aim is to investigate the factors that affect the resistance ...

    3 star(s)

    This is because current consists of electrons flowing through the metal of the wire. The electrons hop from atom to atom in the metal in reaction to the electric field in the circuit. A conductor with a larger cross-section allows more electrons to intermingle with the fields.

  2. Investigate one or more factors affecting the resistance of metal wires

    Different materials have different resistance depending on the materials' atomic structure (composition). The type of material affects the amount of free electrons there are. The number of free electrons depends on the amount of electrons in the outer shell of the atoms.

  1. Investigate factors that affect the resistance of wire.

    Therefore, the wire's resistance will increase. Factors that affect the resistance of wire Aim: I am going to investigate factors that affect the resistance of wire: Introduction The following factors affect the resistance of wire: - Thickness of the wire - affects resistance - a thinner wire would have most resistance, as there is less room for the electrons to move.

  2. Resistance of a Wire Investigation

    Preliminary Method In this preliminary experiment, I will use different lengths of wires to measure their resistance. The main idea of doing the preliminary experiment was to find a suitable current number to put the power supply on. I also wanted to do this experiment to familiarise myself further with

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

    using normal volt meter and ammeter are not as accurate as using multi meter. Because the normal volt and ammeter give the reading to two decimal places whereas the multi meter can give readings up to three decimals places which is more accurate.

  2. Discover the factors affecting resistance in a conductor.

    Use gloves to ensure safety. Use a scalpel to cut the two ends of the carbon putty to make them equal (N.B. I have found that it would be wiser to roll the putty longer than you need it, so that it can be cut to the appropriate length.

  1. Resistance and Wires

    There was only one outlier or anomaly in this experiment which was the recording of the current of the wire with a diameter of 0.88mm. This was recorded in set 1, as 2.85amps. This reading was 22mm different from the recording in set 2, whereas other recordings of wires with different diameters had been much closer to each other.

  2. Investigation of the factors that affect the resistance of a wire.

    The reason for this is that when a current passes through a wire collisions occur between the electrons and the ions and as I mentioned previously, when collisions occur the electrons lose kinetic energy in the form of heat energy making the overall temperature of the wire increase.

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