• 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

In this investigation we are going to investigate the factors affecting the resistance of nichrome wire in an electric circuit

Extracts from this document...

Introduction

Physics investigation

Introduction

In this investigation we are going to investigate the factors affecting the resistance of nichrome wire in an electric circuit

Background Knowledge

The first requirement for conduction is a supply of charge carriers that can move freely through the material. In most solid conductors, notably metals, these carriers are thought to be loosely held electrons. For example, copper has one electron for every atom. The free electrons in a solid conductor are in a state of rapid motion, moving within the crystal lattice at speeds calculated to be around 1/1000 of the speed of light. This motion is normally haphazard (like that of gas molecules) and as many electrons with a given speed move in one direction with the same as in the opposite direction with the same speed. There is therefore no net flow of charge and so no current.

If a battery is connected across the ends of the conductor, an electric field is created in the conductor, which causes the electrons to accelerate and gain kinetic energy. Collisions occur between the accelerating electrons and atoms (really positive ions) of the conductor that are vibrating about their mean position in the crystal lattice but are not free to undergo translational motion. As a result the electrons lose kinetic energy and slow down whilst the ions gain vibrational energy

Electrons move round and round the nucleus in paths called orbits.

...read more.

Middle

Independent Variable

Dependent Variable

Controlled Variable

I am going to change the length of wire during this experiment.

I am going to measure the resistance of the wire by using ohm’s law.

current that we pass through the wire.

material of the wire.

cross sectional area of the wire.

Same room temperature.

Same wire used for every test.


Prediction
I predict that if the width increases then the resistance will also increase in proportion to the width. I think this because the thicker the wire the more atoms and so the more likely the electrons are going to collide with the atoms. So if the width is doubled the resistance should also double. This is because if the width is doubled the number of atoms will also double resulting in twice the number of collisions slowing the electrons down and increasing the resistance. My graph should show that the width is proportional to the resistance.
Because the width of the wire is only half the width of the wire below there should be half the number of collisions between the electrons and the atoms. The wire below is twice the width of the wire above and so there should be twice the number of atoms resulting in twice as many collisions and a predicted doubling of the resistance.

List of the apparatus

  • Power pack supply of up to 12V
  • A full scale deflection ammeter with a measuring range of 0-1
  • A voltmeter with a measuring range of 0-5 V
  • Circuit wires
  • Nichrome wire 0.35m in length
  • A meter ruler
  • Crocodile clips
  • Switch
  • Pencil
...read more.

Conclusion

ass="c3">1.8

1.67

15

3

1.25

1.2

1.25

1.23

2.44

20

3

1.00

1.0

1.00

1.00

3

25

3

0.69

0.69

0.69

0.69

4.35

30

3

0.57

0.58

0.58

0.58

5.17

35

3

0.49

0.48

0.49

0.49

6.12

40

3

0.43

0.42

0.41

0.42

7.14

45

3

0.38

0.38

0.39

0.38

7.89

50

3

0.34

0.34

0.34

0.34

8.82


Safety Precautions

There are not many safety precautions that need to be taken into consideration, in this experiment. The main two I can think of are stated below :

  • Do not carry out the experiment in wet areas, as water is a very good conductor, and thus could be very dangerous.
  • Do not touch the wire when the circuit switched on, because the current would heat up the wire and it may be extremely hot.
  • Keep the voltage at a lowish level so as no-one will be electrocuted

...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)

    is similar to the cross section of a hallway. If the hall is very wide, it will allow a high current through it, while a narrow hall would be difficult to get through due to it's restriction to a high rate of flow. The animation at the left demonstrates the comparison between a wire with a small cross sectional area (A)

  2. An experiment to find the resistivity of nichrome

    To measure the wire width I would use different widths of the same length and same material of wire e.g. thin , medium and thick copper wire with thin and thick constantin wire. To record the difference in widths I would use the same voltage and measure the resistance for each thickness.

  1. Resistance of a Wire Investigation

    Thus, as the amount of sunlight, or in this case light from a bulb, falls on the plant, more energy is absorbed, so more energy is available for the chemical reactions, and so more photosynthesis takes place in a given time.

  2. The Efficiency of an Electric Motor.

    2.72 30.69 0.978 66.07 7.97 10.093216 2.9 15.27668045 10.86841268 904.8 1.2 4.17 1.65 3.03 26.82 1.119 53.10 8.32 9.088716 2.9 17.11506565 11.21553793 804.8 1.2 4.17 1.55 3.23 21.56 1.391 40.10 8.78 8.084216 2.9 20.15933529 11.6839388 704.8 1.3 3.85 1.49 3.36 17.84 1.682 34.56 8.88 7.079716 2.9 20.48761318 11.78347289 604.8 1.35

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

    Prediction: I predict that as the cross-sectional area of the wire widens and increases the resistance will also increase because it is proportional to the cross-sectional area. If the cross-sectional area doubles or trebles, so will the resistance accordingly. Again I can use my preliminary work as a source and

  2. An in Investigation into the Resistance of a Wire.

    The electrons colliding into metal ions causes' resistance. So if the length of the wire is doubled, the electrons will collide into twice as many ions so there would be twice as much resistance due to the electrons that flow through the wire.

  1. Discover the factors affecting resistance in a conductor.

    The factors affecting the resistance in a conductor are as follows. i) Resistance increases as the conductor's length increases. ii) Resistance increases as the conductor's cross-sectional area decreases. iii) Resistance varies depending on the type of material being used. All metals are good conductors.

  2. Factors Affecting the Efficiency of a Wind Turbine

    A hairdryer was switched on and readings were taken. The same procedure was repeated for the remaining two wooden corks. Windspeed in this experiment was constant at 20m/s. A digital multi-meter that allowed greater accuracy and precision was used instead of an oscilloscope because an oscilloscope is very sensitive.

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