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

To investigate how the length of a piece of wire affects its resistance.

Extracts from this document...


Resistance of a Wire


To investigate how the length of a piece of wire affects its resistance.


I predict that when the length of the wire is increased, the resistance will increase. I think this

because -

When a current flows through a piece of wire, a heating effect is caused by the resistance.

This is useful in appliances where heat is needed e.g. Kettles and Heaters.  In a piece of

wire the atoms are arranged in an order. One example is shown below.

The outer electrons are free to move about, and these form the current. The electrons move

randomly through the atoms, bouncing off them, losing energy. If the wire was made longer

there would be more atoms for the electrons to collide with, so they will lose more energy,

meaning the resistance is greater.

I also predict that the graph will be a straight line graph that looks like this -

I think this because, if you double the length of the wire, there would be twice as many

atoms for the electrons to collide with. This means they would lose twice as much energy,

...read more.


to the resistance, so when recording results we will disconnect the circuit as soon as they

have been taken to stop it heating too much.

We will keep the equipment the same and the wire will be measured by a meter stick to

ensure accuracy.


A Table to show how the resistance through a piece of

wire varies with length

Test 1

Test 2

Test 3  

Length /










...read more.


wires get hotter, the atoms vibrate more, so it is harder for the electrons to get, through and

they lose more energy, so the resistance increases. It could also have been because the wire

wasn’t measured correctly, for example if there was a twist in the wire that we didn’t notice,

which would increase the length. This means there would be more atoms for the electrons to

collide with so the resistance would increase.

The points are very tightly scattered, with only one or two points being off the line, and they

are still quite close, showing  that our results are reliable.

To improve this method and prevent errors we could use a water bath to keep the

temperature constant. The wire would be placed in the water bath and then tested.

To make sure the wire was accurate, new wire would have to be used, and made sure it

was flat. It would then be measured using a metre rule to measure to the centimetre.

Our results supported my conclusion and allowed me to make a firm conclusion. They were

reliable, close to the line of best fit and supported our preliminary work.

...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. Investigating how the length of a Wire affects its resistance.

    This can be defended by saying that using a low current means that the heating effect is minimized. This means that the chance of anomalous results can be reduced. This can be counter-argued by saying that the chance of getting anomalous results is increased again by having the current low because the values can be subject to changes very easily.

  2. Investigate how mass affects the diameter of an impact crater.

    EVALUATION: Accuracy: As can be seen from the graphs produced from the results taken, there are no recordings that disperse away from the usual trend. Even though there may be one or two at times that are not as attached as the others, these cannot be described as anomalies.

  1. Free essay

    Investigation: How length affects the resistance in a wire.

    "ƒigÿ!i""#"ƒigÿ$i%"&"'(")"*+",ÿÚ""ó""\"FD ________________ ",c"Ô”"|¾"8c "|¾ " ________________ " " ""8âÿ?ÿâ """"""ÿÿÿÿ "ƒigÿ!i""#"ƒigÿ$i%"&"'(")"*+",ÿÚ""]""Â",Ò ",c"Ô”"|¾"8c "|¾ " ________________ " " ""8âÿ?ÿâ """"""ÿÿÿÿ "ƒigÿ!i""#"ƒigÿ$i%"&"'(")"*+",ÿÚ""Ã""("æ ",c"Ô”"|¾"8c "|¾ " ________________ " " ""8âÿ?ÿâ """"""ÿÿÿÿ "ƒigÿ!i""#"ƒigÿ$i%"&"'(")"*+",ÿÚ"")""�"æ ",c"Ô”"|¾"8c "|¾ " ________________ " " ""8âÿ?ÿâ """"""ÿÿÿÿ "ƒigÿ!i""#"ƒigÿ$i%"&"'(")"*+",ÿÚ""Ž""ø"FD ________________ ",c"Ô”"|¾"8c "|¾ " ________________ " " ""8âÿ?ÿâ """"""ÿÿÿÿ "ƒigÿ!i""#"ƒigÿ$i%"&"'(")"*+",ÿÚ""ù""h"¢ ",c"Ô”"|¾"8c "|¾

  2. To Investigate the Relationship between the Resistance and the Length of a Wire

    0.09 0.20 2.20 0.12 0.25 2.08 0.15 0.31 2.07 0.17 0.37 2.18 0.21 0.45 2.14 0.31 0.67 2.16 Mean Resistance, x = 2.14 Final Experiment Method: I used the same circuit as in the pilot experiment (Fig. 2). For the final experiment I used nichrome wire to investigate the relationship between resistance and wire length.

  1. Investigate how length affects the resistance in a piece of constantan wire.

    Say that the energy released by an electron hitting an atom is x. Say that y electrons pass through both wires, and the electrons collide with every single atom. Say that the number of atoms is a Therefore: R = axy In wire X, R=16xy In wire Y, R=32xy The resistance in wire Y is twice that of wire X.

  2. What affects the resistance of a piece of wire

    exposed to more ions and electrons which is equivalent to more resistance. From this we can see that the resistance is proportional to its length. I will show this by plotting a graph with the resistance against the length and the line going through the origin will be straight due to this.

  1. Find out how the length of a piece of wire affects is resistance.

    This is the physical property unlike resistance, which is not. If we consider current flowing through a unit cube of material, resistivity is defined as the voltage measured across the unit cube's length (V/m) divided by the current flowing through the unit cube's cross sectional area (I/m2).

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

    Variables: 1.5.1. RESISTANCE (of entire circuit) The resistance is the most important variable in this experiment since this is the one that we are going to investigate. This is the dependent variable since it depends on the length or the cross-sectional area of the wire and the rheostat value.

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