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

The Factors Affecting The Resistance Of A Wire

Extracts from this document...


Samir Khan 4S2        Factors Affecting Resistance Of A Wire

Mr. Kerr

The Factors Affecting The Resistance Of A Wire


Aim: - The aim of this investigation is to investigate what effects different factors have on the resistance of a wire.The investigation will determine what effects the factor we choose has on the resistance of a wire.  

Variables and Key Variables: - There are many possible independent variables that could be changed in order to affect the dependant variable.  The dependant variable in this experiment is that of resistance.  This means that resistance will not be changed or controlled during the resistance but the independent variable will be used to change it.  I came up with many initial ideas for things that could be used as the dependant variable in my investigation.  These include: -

  • Length
  • Width- Diameter/Cross-Section
  • Current
  • Voltage
  • Temperature
  • Material
  • Room Temperature
  • Age Of Wire
  • Humidity
  • Light
  • Pressure
  • Magnetism

Preliminary Work: - In order to find out the best variable to investigate with regard to what affect it has on resistance a number of preliminary tests had to be carried out.  The aim of these small-scale experiments was to see which of the possible dependant variables have an effect and then to find out which of them would be best to investigate.  Some possible variables had to be ruled out from the start.

...read more.


: - The next decision I was required to make was to select the best wire to use for my investigation out of those available.  In order to find this I had to experiment using different wires in order to see which one with which thickness is the best to use.  For the first part, in order to find out which thickness to use, I decided to select a wire to use.  I decided to use Constantan simply because it had the greatest range of wires.  I decided to observe the resistances of the same material of wire using different thickness.  This was done by connecting the wire to an ohmmeter and observing the resistances.  The wire was connected using crocodile clips and the length of these crocodile clips apart from each other was how I measured the length.  A metre rule was placed next to it in order to ensure accuracy.

Diameter 0.914cm

Length (cm)








Diameter 0.152cm

Length (cm)








From these results in the preliminary experiment it is obvious that the greater the width the greater the resistance and therefore the greater the range of resistances in our results.  Therefore from this experiment I conclude that I decided to use diameter 0.152cm for the main investigation.

...read more.


I will now explain scientifically why certain variables must be kept the same throughout the investigation.  The temperature must be kept the same as when you raise the temperature more atoms vibrate and this impedes the passage of free electrons.  Thickness of the wire must be kept the same as if you vary this you also vary the amount of room electrons have to manoeuvre.  Finally the current must also be kept constant because as this increases so does the temperature of the wire.  All these precautions must be taken in order to ensure that the data obtained is as accurate as possible as well as being reliable.

...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. Marked by a teacher

    The factors affecting the resistance of a metalic conductor.

    4 star(s)

    in parallel, there are actually two wires in use that have been connected (using a parallel connection) the cross sectional area of the wire is actually increased and the electrons flowing through it will have a shorter distance to travel and thus the resistance will be decreased.

  2. Marked by a teacher

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

    3 star(s)

    Here I have to prove that the resistance is same for both wires. So if the electrons travel in the same distances, the collision of electrons with the atoms of the wire will be the same and so the resistance of the wire will be the same.

  1. Factors Affecting the Efficiency of a Wind Turbine

    4. Wooden Cork 5. Retort stand 6. Wires 7. Wind gauge 8. Copper Method Blades were cut from a thin copper foil and this is how it was done. 1st Step 2nd Step 3rd Step 4th Step How blades were made On the first step, blades were cut along the dotted line as shown.

  2. To investigate the factors affecting current in a wire.

    Isotopes are atoms with the same number of protons but different numbers of neutrons. Isotopes that emit radioactive particles are called radioactive isotopes. When the nucleus of a radioactive isotope emits an alpha or beta particle - it is said to decay.

  1. Physics GCSE Coursework:Factors affecting the resistance of a wire

    proportion to the width" From my graph I have shown that my prediction was correct, as the Line of Best Fit is a straight line proving that the resistance of the wire is proportional to the width of the wire.

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

    so will have a lower current, which will be safer to use than use a material with a low resistance. As I have mentioned, I have decided not to investigate the factors of temperature and type of material. Investigating temperature is difficult to control since it is hard to control the range of temperatures needed without the correct apparatus.

  1. Discover the factors affecting resistance in a conductor.

    being wasted-you can hear the noise and see the water being thrown up in the air." Measuring Resistance Resistance is measured in units called ohms (?). For example, a 10? resistor would have twice the resistance of a 5 ?

  2. Factors affecting Resistance of a wire

    resulting in twice the number of collisions slowing the electrons down and increasing the resistance. If the length was halved the resistance should also half, as the amount of collisions of atoms & electrons should half. My graphs should show that the length is proportional to the resistance.

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