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

Investigate how electrical resistance varies with different lengths of wire.

Extracts from this document...


Kirsty Skinner 10/6



To investigate how electrical resistance varies with different lengths of wire.


I think that when the length of wire is increased, the resistance increases aswell.

In a piece of wire the atoms are arranged in a regular pattern called a lattice. The positive charges within an atom are concentrated in its nucleus and are unable to move, but the negative charges re the electrons, which are quite a distance away from the positive nucleus and are continually moving. Some of the outer electrons are able to drift from atom to atom. If a cell is connected across the wire more of the electrons will flow towards the positive terminal. This flow of charge creates an electrical current.

As the electrons in an electric current move around a circuit they bump into the atoms in the wire through which they pass. They collide with the atoms in the wire, which vibrate more quickly. We call this resistance. If the resistance of the wire is high, this means that the electrical current that is flowing is slowing down because of the resistance in the wire. If the voltage is high and the current is high, the wire increases in temperature, which causes yet more resistance in the wire.  

...read more.




















































Diagram 2

Method 2

  1. Set up apparatus as in the diagram.
  2. Using just the multi-meter, and the wires, measure the resistance through them. Then take away that resistance from the end measurement.
  3. Then use the 120cm of wire as the resistor.
  4. Turn on the multi-meter to ohms.
  5. Read off the resistance off the multi-meter, which calculates the resistance automatically. Put the reading into the results table.
...read more.


If I were to do the experiment again I would change the way we measured the wire.  I would attach the clip at the start, then measure the wire, and then attach the second clip so I would have the correct measurement of wire.

I can say that the conclusions I have got from the results are fairly safe.  My results support the prediction over the range investigated. It would be better to have more readings, say increasing by 5cm instead of 20cm to get more readings. By doing this I would get a better range of results and more points on my graph.

Overall I think my measurements were fairly accurate. From my graphs I can see the multi-meter test was more accurate because only 3 out of the 5 points were slightly out of the line.  I think I had these anomalies in my results because of the problems I had.

As before I explained that the first method wasn’t very accurate because I didn’t always get the exact measurements I wanted to work out the resistance so therefore my 2nd experiment had slightly different results, because of the different equipment I used, like the voltmeter and the ammeter, and then substituted them with an multimeter to produce a better, more accurate set of results.

As an alternative investigation I could look at how wires of different cross-sections, affect resistance.

...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. Investigate the resistance of different wires and how at different lengths the voltage increases ...

    I will also be using digital and analogue ammeters which will help me to ensure that the current is the same throughout the experiment and I am using 2 to calculate an average from the two readings to give an accurate reading I will also be needing a set of

  2. An experiment to find how the resistance of a pencil lead varies which the ...

    M.D.F., which is particularly non-conductive and will stop the lead being damaged during the process of the experiment, or coming into contact with something conductive, and thus altering the results. I will plug a lead into the + end of the battery pack, and then fasten a crocodile clip to the other end of the wire.

  1. How The Resistance Of A Wire Varies With Length.

    kept comming unattached to the meter stcik and the wire its self was only just over a meter. Solutions: I found soloutions to the majoraty of my problems.I replaced the ammeter and voltmeter to see if that made a difference but it didn't so I checked to see that I

  2. Investigate how the resistance changes in a wire of different lengths.

    An electron has to travel further and bump into more electrons, losing more heat energy and heating up the wire more. The longer the wire gets, the more resistance there would be. This is why the graph is a straight line.

  1. An Investigation into Finding the Different Values of Resistance with Different Lengths of Wire.

    Use diagrams if you wish. Safety In this experiment there are few but important safety issues to consider and are the following: * Not to touch the wire as when current flows through the wire, the wire may become hot. * Not to touch the electricity.

  2. Look at the various lengths of Constantine wires and observe how their lengths might ...

    Therefore V � I is constant. This means that the resistance of a metallic conductor is constant providing that the temperature also remains constant. Furthermore, the resistance of a metal increases as its temperature increases. This is because at higher temperatures, the particles of the conductor are moving around more quickly, thus increasing the likelihood of collisions with the free electrons.

  1. How resistance varies with different lengths of wire.

    Preliminary results Length of wire (cm) Voltage (v) 100 90 80 70 60 50 40 30 20 10 6.0 5.5 4.6 4.1 3.5 3.0 2.6 2.0 1.0 0.5 From these results I decided to change the ammeter to a scale of 0-5 instead of 0-15, because this would give it more accurate readings.

  2. Objective: to investigate how the rate of resistance is affected by the different thicknesses ...

    The reason for this happening is because there will be greater amount of atoms in a lengthy piece of wire than a shorter one. This will mean that the collisions between the electrons and atoms will be more frequent as the possibility are high, very likely to happen.

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