• 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)

    8 ohm rated at 5 A Safety Some components may become hot enough to burn fingers. Procedure a Set up the circuit as shown below. The potential difference across the lamp will be shown on the voltmeter or millimeter, set to volts and placed across the lamp as shown and the current on the ammeter.

  2. Resistance and Wires

    proportional 'line of best fit' from (0, 0), at a rate of increase of 2.6ohms per 10cm. The presence of a small amount of wire could result in a disproportional amount of initial resistance. Conclusion In conclusion of this experiment, the results show that as the length of the nichrome wire is increased, the resistance of it increases.

  1. Discover the factors affecting resistance in a conductor.

    I did, however, feel that the multimeter experiment showed a more consistent line of best fit, so that the results were more reliable. I also felt that the Voltmeter was not an entirely accurate item of apparatus, as the results displayed were not constant and wavered quite considerably, as the

  2. How does current vary with voltage in a light bulb?

    My preliminary work has proved that the wire obeys Ohms law, as long as the temperature is constant. You can see from the calculations of resistance that is relatively constant throughout the experiment only vary by 1/10 of an ohm at the higher voltages.

  1. Investigating The Characteristics Of A Filament Lamp

    However, the line of best fit only began to curve slightly towards the end of the results, and therefore was starting to show that the filament lamp in an non-ohmic conductor. I then decided to extend the range of results until 10.0V, again taking three repeats of the current.

  2. Factors which affect the resistance of a wire

    does not get burnt - The table I am conducting my experiment on must be clear and have enough space to hold my apparatus so that it doesn't accidentally get knocked off my table. - The wire I am going to use in my experiment should be all straight as

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

    Collecting Data Nickel Power Pack Length (cm) Voltage Current Resistance 4 10 1.34 2.99 0.45 4 20 1.91 2.14 0.89 4 30 2.08 1.59 1.31 4 40 2.18 1.24 1.76 Copper Power Pack Length (cm) Voltage Current Resistance 4 10 0.25 8.06 0.03 4 20 0.36 8.08 0.04 4 30 0.56 7.78 0.07 4 40 0.65 7.41

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

    This material was Constantan. Constantan is a metal alloy, which shows very small resistance change with temperature under normal laboratory conditions (Constantan only increases resistance by about one-hundredth-thousandth part per Kelvin rise in temperature). Knowing this fact, I decided that I would base my main experiment on constantan rather than

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