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

To find out what factors affect the resistance of a wire (besides current of temperature)

Extracts from this document...

Introduction

Aim: -

To find out what factors affect the resistance of a wire (besides current of temperature.) We must use two different variables.

Variables: -

Variables Chosen Variables

Length of wire.

Thickness

Type of wire.

Chosen Variable: -

I have chosen length of wire as one as my variables because it will give me a good range of results. I will be able to compare the results from the shortest wire to the longest. I will start at 100cm then I will take 10cm off each time until I get to 50cm. (100,90,80,70,60,50cm)

The type of wire will also give me a good range of results because I will be able to see if the difference in thickness of wire makes a difference and if the different type of wire makes a difference. (E.g. aluminum and copper.) The thickness will range between 0.71mm and 0.20mm. So I will do as many different types of metal that I can do with in the allotted time.

Prediction: -

For preliminary work, we tested how the temperature of a circuit can affect the resistance of a bulb filament. We altered the temperature of the wire by changing how much power passed through the wire – using a rheostat.

...read more.

Middle

When you measure the piece of wire lay it out on a one-meter ruler and hold it and one end and count in the appropriate number. You can re measure it if it is not the correct number. The wire must be straight when being measured.

Coil the wire around the pencil and attach to circuit. Make sure no crossovers. (The circuit will short circuit if there are crossovers)

Take readings form ammeter and voltmeter. Do three repeats to improve accuracy. Do the repeats by altering the rheostat. One from either end and one from the middle.

Record results again. Repeat with different length wire.

When doing different type of wire as the variable measure it out to 102cm each time and again measure in 1cm from each end and place the crocodile clips on 1cm in. Then do the same three repeats using the rheostat and then change the type of wire. I will be using the thinner wires so that is why I have gone under 100cm in-between the clips. When attaching the wires make sure that the wire is not long and thin because it will have no amp reading. If the wire is short and fat it will have no volt reading.

...read more.

Conclusion

Set up apparatus just like circuit shown in the diagram. You will need a voltmeter, ammeter, battery pack (6volt pack), six wires and a piece of Measure out a piece of wire at 102cm and mark in 1cm at each end then clip it right on the 1cm mark.

When you measure the piece of wire lay it out on a one-meter ruler and hold it and one end and count in the appropriate number. You can re measure it if it is not the correct number. The wire must be straight when being measured.

Place the wire over the crack glue the clips to the wall. Make sure no crossovers. (The circuit will short circuit if there are crossovers)

Take readings form ammeter and voltmeter. Do three repeats to improve accuracy. Do the repeats by altering the rheostat. One from either end and one from the middle.

Record results again. Repeat with different length wire.

You could stick the wire across the crack and measure the resistance. The wire would be floppy at the moment. You could then come back after a month and measure the resistance again. If the resistance had increased the wire would have got longer. Therefore the crack would have widened. The apparatus will rest on the floor.

...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

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

    3 star(s)

    If it was likely to use new/tested equipments and to be able to use the same equipment for each experiment then there may be less existing argument. Accuracy on length: The only obtainable way for measuring was by ruler and hand.

  2. Resistance and Wires

    This would mean that each range bar would be of a more similar size and they would not increase as length was increased. As shown on the graph, the line of best fit if kept straight would not go through the point (0, 0)

  1. An experiment to find the resistivity of nichrome

    The reason that the length is proportional to the resistance is to do with free electrons. The free electrons constantly flow around the circuit, as fast as they can. The ions in the circuit though, get in their way, and the electrons and ions collide causing resistance.

  2. Factors which affect the resistance of a wire

    scissors as they are sharp objects - The voltage used is 3Volts so the wire does not overheat too much and cause a fire. - When I am conducting my experiment I will also tie my hair up in case the wire does cause a fire so that my hair

  1. Investigate the factors that affect the resistance of a wire.

    The unit of resistance is the ohm. The ohm is the amount of resistance that limits the passing of current to one ampere when a voltage of one volt is applied to it.

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

    high voltage) with the two factors at the lower current. * I must take the readings at the same intervals throughout the experiment - for example, the length of the wire will be measured every 10cm. * I will compare cross-sectional areas at the same length of wire to see the effect of thickness/diameter on the resistance.

  1. Investigating The Factors Which Affect The Resistance In A Wire

    My preliminary tests show that the current for copper was unstable because the first test was lower than the second test which shows that it was hard to record the results. Nickel shows to be more stable because the results are as expected.

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

    This causes more collisions between the electrons and the ions, as they will be moving into the path of the electrons more frequently. When the electrons collide with the ions they lose some of their kinetic energy in the form of heat energy and this causes them to move more slowly thus making the current intensity in the wire decrease.

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