• 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

# find the factors which may affect the resistance of a piece of wire

Extracts from this document...

Introduction

Amish Hirani 10N

GCSE Science Investigation

Aim:

The aim of the investigation was to find the factors, which may affect the resistance of a piece of wire.

Prediction:

I predict that the longer the wire, the higher the resistance. I also predict that as the length of the wire doubles so will the resistance and doubling the cross-sectional area would decrease the resistance by a factor of two. This is because the resistance under constant temperature conditions is directly proportional to the length of wire and inversely proportional to the cross-sectional area.

Resistance = Resistivity of Wire x Length of Wire / Cross-Sectional Area of Wire

The type of metal, the wire is made up of could also affect the resistance because different metals have their own quantity of resistivity. Finally the temperature conditions affect the resistance because the temperature causes the conduction electrons moving through the wire to collide with the electrons in the atoms more frequently. This converts some of the electrical energy to heat, which causes the resistance to increase.

Hypothesis:

I think that as the length of wire increases so will the resistance.

I think this because the resistance under constant temperature conditions is directly proportional to the length of wire and inversely proportional to the cross-sectional area.

Plan:

In this experiment we will be varying the length of the wire.

Middle

Length of wire (cm)

Current

(Amps/A)

Voltage

(Volts/V)

Resistance

(Ohms/Ω)

10

1.48

2.33

1.57

15

1.40

2.44

1.74

20

1.03

2.45

2.38

25

0.76

2.54

3.34

30

0.60

2.60

4.33

35

0.55

2.63

4.78

40

0.49

2.65

5.41

45

0.39

2.67

6.85

50

0.35

2.67

7.63

55

0.32

2.69

8.41

60

0.29

2.69

9.28

65

0.27

2.70

10.00

70

0.26

2.71

10.42

75

0.24

2.74

11.42

80

0.22

2.74

12.45

85

0.21

2.76

13.14

90

0.20

2.77

13.85

95

0.19

2.78

14.63

100

0.18

2.80

15.56

 Length of wire (cm) Current(Amps/A)

Conclusion

We might have made it inaccurate by using a wire, which was not visibly straight; this may have caused error in measuring the wire perfectly. The wire had cello tape attached to it to keep it stuck to the ruler so we could measure the length of the wire more easily. This might have made it inaccurate as the cello could have an affect on the circuit, as it is part of it.

My points were very close to the line of best fit. This indicates that our results were reliable and that we did not have any anomalous results. Our experiment was accurate and our results had a very strong correlation. My points were practically along the straight line signifying we did not make mistakes during taking results and it was a fair test.

The diameter of the wire was measured by an engineering piece of equipment. This was tightened around the wire and then when we couldn’t tighten it any more, we read the measurement. It gave us the measurement of 32mm.

We realised that when length of wire = 0 there was still resistance. This is because the connecting wires are the wires causing the resistance. In any circuit there will always be resistance.

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

# Related GCSE Electricity and Magnetism essays

1. ## This experiment will show, by using the volts and current to calculate in an ...

By looking at how much the resistance increases after every result I can see that the results are reasonably accurate: The increase in cm of wire from... amount of resistance increased resistance increased(to2dp) 10 to 20 0.480857012 0.48 20 to 30 0.379889122 0.38 30 to 40 0.433444212 0.43 40 to 50 0.403152174 0.4 The resistance increased by about 4?

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

The most obvious reason is that when the electrons collide with the atoms, they lost energy, which creates resistance. This energy is transferred to the atoms, which start vibrating, and these vibrations produce heat. These vibrations deflect the path of the electrons even more than when the electrons collide with "stationary" atoms, and therefore lost greater energy.

1. ## An experiment to find the resistivity of nichrome

The law is usually expressed by the formula I = E/R, where I is the current in amperes, E is the electromotive force in volts, and R is the resistance in ohms. This enables us to work out the resistance using the current and Voltage.

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

For this reason it is possible to say that the greater the density of a conductor, the greater its resistance. For this reason as well as the molecular structure of the conductor and the number of free electrons it has, I predict that not all materials will conduct electricity to the same extent.

1. ## An Investigation to Calculate the Resistivity of a Piece of Wire.

This is similar to pipe with water flowing through it, the relationship between radius of a round wire and cross sectional area using the formula- Area = ? R2 Where R = Radius Example- Radius (mm) ? R2 (mm2) 1 3.14 2 12.56 3 28.27 4 50.26 If the radius

2. ## An experiment to find out what factors affect the resistance of a wire

Fair Test To make this experiment a fair test I have to keep the voltage the same (4V). I must use the same material for the wire and must try to keep the wires at the same temperature as both of these can alter the resistance.

1. ## Investigation to find out what factors affect the resistance of a wire?

a thick wire because there is more room in a thick wire for the electrons to flow. The electrons pass through a thinner wire less easily because there is not as much room to go around the fixed atoms. The resistance will depend on length because in a longer wire,

2. ## Investigating the Factors that may affect the Resistance of a Piece of Wire

Results of my pilot experiments Material Current, A Voltage, V Resistance,? Width, swg Length, cm Copper 2.09 0.03 0.014 22 10 Constantan 1.82 0.27 0.148 22 10 Here are the results for my pilot experiment: The Material Firstly I had to find out which material I should use for my experiment copper and constantan.

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