• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month
Page
  1. 1
    1
  2. 2
    2
  3. 3
    3
  4. 4
    4
  5. 5
    5
  6. 6
    6
  7. 7
    7
  8. 8
    8
  9. 9
    9
  10. 10
    10
  11. 11
    11

Factors affecting the resistance of a wire

Extracts from this document...

Introduction

RESISTANCE OF A WIRE INVESTIGATION

Skill Area P; Planning Experimental Procedure

Hypothesis

Four factors affecting the resistance of a wire are:

·  The temperature of the wire.  If the wire is hotter than usual then electrons are given more energy and collision is more frequent.  Therefore the resistance is greater.

·  The length of the wire.  The length of the wire is directly proportional to the resistance and so if the length of the wire is longer, then the resistance of the wire is greater.

·  The width of the wire.  Thick wires have more free electrons per unit cross-sectional area than thin wires.  Therefore thicker wires will have a larger resistance than thinner wires

·  The metal that the wire is made out of.  Some metals conduct heat easier and quicker than others.  All metals are good conductors because there are lots of free electrons to move between the atoms of the metal.

Prediction

If the length of the wire is doubled, then the resistance will double.  This means that the resistance is proportional to the length of the wire.

As the length of the wire is increased, there are more atoms present for electrons to collide with and therefore resistance is greater.  More and more atoms can also collide and collisions become more imminent.  There are more and more free electrons and when the electrons collide with atoms, energy is transferred to the atoms that start to vibrate and the material becomes hotter.

...read more.

Middle

90.0

0.40

3.64

9.10

90.0

0.50

4.53

9.06

90.0

0.60

5.46

9.10

Average Resistance:

9.04

Length of a wire (centimetres)

Current I (Amperes)

Voltage V (volts)

Resistance R=V/I (ohms)

80.0

0.20

1.59

7.95

80.0

0.30

2.43

8.10

80.0

0.40

3.25

8.13

80.0

0.50

4.05

8.10

80.0

0.60

4.88

8.13

Average Resistance:

8.08

Length of a wire (centimetres)

Current I (Amperes)

Voltage V (volts)

Resistance R=V/I (ohms)

70.0

0.20

1.42

7.10

70.0

0.30

2.15

7.17

70.0

0.40

2.87

7.18

70.0

0.50

3.57

7.14

70.0

0.60

4.30

7.17

Average Resistance:

7.15

Length of a wire (centimetres)

Current I (Amperes)

Voltage V (volts)

Resistance R=V/I (ohms)

60.0

0.20

1.20

6.00

60.0

0.30

1.81

6.03

60.0

0.40

2.44

6.10

60.0

0.50

3.05

6.10

60.0

0.60

3.65

6.08

Average Resistance:

6.06

Length of a wire (centimetres)

Current I (Amperes)

Voltage V (volts)

Resistance R=V/I (ohms)

50.0

0.20

0.99

4.95

50.0

0.30

1.50

5.00

50.0

0.40

2.04

5.10

50.0

0.50

2.53

5.06

50.0

0.60

3.07

5.12

...read more.

Conclusion

Anomalous Readings

There are no anomalous readings in my results.  All my results are touching or very close to the line of best fit.  This just shows how successful my experiment actually was.  However if there were anomalous readings then I would have identified them on my graph and tables as anomalous.

Improving the Accuracy of the Readings

My readings are very accurate, however if I wanted to make them even more accurate I could use a digital ammeter rather than an analogue ammeter that I used in my experiment.  This way I could simply read the current and the readings would probably be to 2 decimal places.  Therefore my results would be much more accurate.

Improving the Reliability of the Evidence

To improve the reliability of my readings I could have repeated the experiment more times.  Also, I could have even used a much more higher scale with the length of wire such as 10cm to 300cm.  We could also use a data logger to measure readings.  Data loggers are much more accurate as they measure digitally through a computer.  We could also use improved contacts on wire; so we don’t have any rusty wires etc.  We could also use intervals of 5 centimetres to get twice as many points on the graph.

Kai Baker

10 Alpha

Physics Coursework

Mr O’Malley

...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)

    a smaller cross sectional area and pass current through it via a parallel circuit, the resistance is slightly higher than when using a normal circuit. This is because placing resistors in parallel is equivalent to increasing the cross-sectional area A through which current can flow.

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

    The width of the wire affects the resistance of the wire because the number of atoms in the wire increases or decreases as the width of the wire increases or decreases in proportion. The resistance of a wire depends on the number of collisions the electrons have with the atoms

  1. Discover the factors affecting resistance in a conductor.

    5 wires for ammeter/voltmeter experiment: To connect up the circuit 2 wires for the multimeter experiment: To connect the carbon putty to the multimeter Two Crocodile Clips: The crocodile clips are attached on the end of two of the wires to make contact with the 2p coins in the ammeter/ voltmeter experiment.

  2. An investigation into the factors affecting the resistance of a wire.

    I have chosen to use these lengths (every 10cm) because they are easily measured by the meter ruler and give a good range of results. * Once I have my first full set of results I will repeat the test a further two times.

  1. Factors affecting Resistance of a wire

    As a result, the ammeter shows a lower current with the same voltage. In a short circuit are less particles of wire. This means less collisions and a lower resistance. I have illustrated this below. Resistance is caused by collisions - more collisions means more resistance.

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

    The reason I have used an alloy to a pure metal such as copper is because alloys have a high resistance and so it will give a more range of values to plot on the graph, which will improve the accuracy of this investigation.

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

    Voltage (Volts) Current (Amperes) Resistance (Ohms) 10 2.00 0.95 2.11 20 2.00 0.46 4.35 30 2.00 0.29 6.91 40 2.00 0.21 9.52 50 2.00 0.16 12.50 60 2.00 0.13 15.38 70 2.00 0.11 18.18 80 2.00 0.09 22.22 90 2.00 0.07 28.57 100 2.00 0.06 33.33 Plan APPARATUS: - 1m

  2. Factors Affecting the Current Flowing

    surrounded by electrons. These electrons are free to move through the structure of the metal. When there is no applied external electric field, the electrons move randomly. When an electric field is applied, however, the electrons will be attracted towards the more positive potential and the cations towards the more negative potential.

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