• 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)

    R x A is to some extent constant. And this supports my calculations that the thicker the wire, the lesser its resistance. This concludes that the resistance of a wire is inversely proportional to its thickness: R ? 1/A. This is because of the fact that the electrons flowing through the wire bump with other atoms of the wire.

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

    Results Constantan wire, diameter 0.45mm Area of cross-section = ?d� /4 = (? x 0.45�) /4 = 0.159 mm� Potential difference (V) applied from battery pack Length Ammeter reading (I1) Ammeter reading (I2) Resistance1 (?) Resistance2 (?) Volts Cm Amps Amps Ohms Ohms 4.5 10 2.04 2.09 2.21 2.15 4.5

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

    Step 4 Clip the crocodiles clips exactly to the edge of the sellotape on the wire. The wire that is not in between the two crocodile clips will get no electricity flowing through it because they are not part of the circuit.

  2. Resistance of a Wire Investigation

    The ammeters and voltmeters could have been damaged and reading falsely on both the meters used. Measuring the lengths of the wire is also a inaccuracy as the rulers used are not exact, and it is difficult to get an accurate reading of length by eye, as the wire might

  1. Discover the factors affecting resistance in a conductor.

    Detailed Strategy After looking at all the basic requirements for the experiment, we can draw up a detailed method with which we can conclude the preparation of the experiment. The apparatus, measurements, variables and plan will be taken into account, as well as the highest standard of safety possible.

  2. To investigate how the length (mm) and the cross-sectional (mm2) area of a wire ...

    how resistance is created in a wire and what factors affect it. 5. EXTENSION PLAN 5.1. Aim: To investigate how the density of a wire (mg/mm3) affects its resistance (ohms). 5.2. Apparatus: To effectively carry out this experiment and get the most accurate results, I have to ensure that I have the best and most accurate equipment at my disposal.

  1. Resistance and Wires

    They are adjusted by rotating the ratchet. This moves the spindle and thimble down the sleeve. The sleeve has numbers on it which displays the wires diameter when tightened. The table of results from the measurement of the wires is shown below: Diameter (mm)

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

    When one factor is investigated during the experiment, by carrying out the plans written below, all of the other factors mentioned previously must be kept constant to ensure fair testing however the temperature of the wire cannot be controlled since it rises automatically when a current passes through it.

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