• 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

Investigate how the resistance of a wire is affected by the length of the wire.

Extracts from this document...

Introduction

Science Investigation

Resistance of a wire coursework

P

O

A

E

spg

Total mark =

Name

Ridwan Ibrahim

Form

Coleman

Teacher

Br. Ronald

Set

10 ACF Set 1


Aim:

To investigate how the resistance of a wire is affected by the length of the wire.

Theory

Introduction

Electricity travels through a conductor by means of free electrons. The conductor in this investigation is a nickel wire. The number of free electrons depends on the material of the conductor. The more free electrons there are, the better the conductor due to less resistance. For example, silver has more free electrons than iron; therefore it is a better conductor. The free electrons are given energy and this makes them move and collide with other free electrons. This happens across the length of the wire and thus electricity is conducted. Resistance is the result of energy loss as heat. It involves collisions between the free electrons and the fixed particles of the metal. These collisions convert some of the energy that the free electrons are carrying into heat.

The resistance of a length of wire is calculated by measuring the current in the circuit (in series) and the voltage across the wire (in parallel). The measurements are then substituted into the following formula:

V = I * R                (V = Voltage, I

...read more.

Middle

0

0

0

0

0

0

0

0

0

0

0

10

0.46

0.63

0.77

0.30

0.40

0.50

1.53

1.58

1.54

1.55

20

0.93

1.23

1.54

0.30

0.40

0.50

3.10

3.08

3.08

3.09

30

1.36

1.86

2.36

0.30

0.40

0.50

4.53

4.65

4.72

4.63

40

1.82

2.50

2.96

0.30

0.40

0.50

6.07

6.25

5.92

6.08

50

3.50

2.63

1.92

0.47

0.35

0.26

7.45

7.51

7.38

7.45

60

3.45

2.66

1.98

0.37

0.29

0.23

9.32

9.17

8.61

9.04

70

3.12

2.64

2.12

0.30

0.24

0.20

10.40

11.00

10.60

10.67

80

2.37

2.68

3.60

0.19

0.22

0.29

12.47

12.18

12.41

12.36

90

2.22

2.11

3.45

0.15

0.18

0.25

14.80

11.72

13.80

13.44

100

2.09

2.66

3.44

0.14

0.17

0.22

14.93

15.65

15.64

15.40


Compared to other results

In order to prove that my results are reasonably accurate, another results table is shown derived from another person who undertook the same investigation in the same environment.

Length (cm)

Potential Difference (v)

Current (I)

Resistance (ohms)

V1

...read more.

Conclusion

Actual resistance for particular length (ohms)

Percentage error (to two decimal places)        %

10

1.55

1.53

1.31

20

3.09

3.06

0.98

30

4.63

4.59

0.87

40

6.08

6.12

0.65

50

7.45

7.65

2.61

60

9.04

9.18

1.53

70

10.67

10.71

0.37

80

12.36

12.24

0.98

90

13.44

13.77

2.40

100

15.40

15.30

0.65

Evaluation

I believe that the investigation was moderately accurate. My evidence to support this is my average percentage error which is 1.24%. This error may have occurred due to a number of reasons. Firstly, it is impossible to keep the temperature constant throughout the whole experiment in a classroom laboratory. So due to heating of different appliances, the temperature may have altered to cause the percentage error. Furthermore, to connect the wires we used crocodile clips. We may have made a human error whilst connecting the crocodile clips to the wire as we cannot be precise in measurements using only the naked eye.

In order to improve my investigation in the future I will use clean crocodile clips and try to be more precise when connecting them to the wire so my measurements are more accurate. Also I will try to use more means in order to keep the temperature constant. To make my investigation even more accurate I will repeat it many times and compare it with other results from people who did the same investigation. Furthermore, I would use a conductor that is stiff so that is does not bend and alter the length when measured on the ruler.

   Ridwan Ibrahim, Physics Coursework, Br Ronald

...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)

    The above-mentioned results occur due to the fact of how many free electrons are being conducted through the wires of different lengths and areas. * In the case of length; the resistance increases as the length increases because a wire with a shorter distance will have a smaller amount of atoms for the free electrons to hit.

  2. Marked by a teacher

    In this coursework, I will be analyzing and proving that although metallic conductors are ...

    3 star(s)

    well this is due to thermal agitation, where electrons, take heat from the air, even if it is at room temperature, and there is no heat that we feel. In addition, this thermal agitation causes atoms too, to vibrate, and shake.

  1. Discover the factors affecting resistance in a conductor.

    This will result in a straight line on a graph that passes through the origin. I can confirm this because if no other factors affect the decrease in resistance, the decrease must be constant. I can draw a prediction graph to show this decrease, however I cannot predict what the

  2. Resistance of a Wire Investigation

    Chlorophyll does not absorb green light or yellow light effectively but tends to reflect them, decreasing the amount of light absorbed and decreasing the rate of photosynthesis. Why the rate of photosynthesis increases or decreased from the amount of light energy absorbed is what is being investigated in this experiment.

  1. The aim of this investigation is to investigate the factors affecting the resistance of ...

    26 125 10 1 3.0 Constantan 26 125 10 2 3.0 Constantan 26 125 10 3 3.0 3.0 1.3 Constantan 28 125 10 1 2.8 Constantan 28 125 10 2 2.8 Constantan 28 125 10 3 2.7 2.8 1.4 Table 5 (Varying Length)

  2. To investigate how the length (mm) and the cross-sectional (mm2) area of a wire ...

    Given that the power source remains constant, the amount of current passing through any point in a circuit remains constant, but as the length of the wire increases, the voltage increases because there is more energy lost and so the resistance increases due to Ohm's law. Lets consider some examples.

  1. Investigate the factors That Affect the Flow of Electricity Through a Conductor.

    to fit the requirements because this did not greatly affect the current flow or was the cause of overheating I also had to find over what range to take my measurements, and a rate at which to increase the variable by.

  2. To investigate the relationship between the structure and heat provided by combustion of a ...

    The type of stirring in terms of frequency and power may affect the results also, and must be kept constant. To control this variable, the same type of stirring will be used each time. The only variable in the experiment will be the changing type of alcohol being combusted, as this is what is being investigated.

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