• 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
12. 12
12

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

Extracts from this document...

Introduction

## For this piece of coursework the factor that I will be investigating willbe how the length of a wire will affect the resistance in which acts upon it. I am not going to be investigating temperature, as it is too difficult to measure the temperature within a wire. Temperature affects the wire but as I am using the same piece of wire in the same classroom, I think that the wires temperature will be fairly equal throughout my experiment. Though it will not be 100% accurate.

Background Knowledge

## Voltage is the electrical force, or "pressure", that causes current to flow in a circuit. It is measured in VOLTS (V or E).

Middle

3.85

0.18            0.2            0.2

0.19

20.26

## I predict that as the length increases then the resistance will also increase in proportion to the length.                                                                                   This is due to the idea of the free moving electrons being resisted by the atoms in the wire. In a longer piece of wire, there would be more atoms for the electrons to collide with and so the resistance would be greater. The relationship between the wire length andthe resistance should be approximately proportional. This is because in a wire twice the length of another wire there would be double the amount of atoms causing the resistance. In theory, if the wire is doubled, then so will the resistance. If the length is twice as much, then there will be twice as much collisions, which would increase the resistance.

An example of this would be in a 20cm wire. The electrons would have to travel double to distance they would have to go through a 10cm wire. This would in turn double the amount of atoms that the electrons would collide with and then resistance would double.                                                                                        Furthermore, my preliminary test backs up my prediction because it illustrates that resistance increased with length.

I can further support my hypothesis because I know from my scientific knowledge and research that:

Conclusion

Further experiments I could do which are related to the resistance in a wire, would be to see whether the following factors would make a difference in the resistance of a wire: (I have made a prediction for each factor from my own scientific knowledge on how I think the resistance would change in a wire for that particular factor):

" Wire width:

I think that if the wire width is increased the resistance will decrease. This is because of the increase in the space for the electrons to travel through. Due to this increased space between the atoms there should be less collisions.

" Temperature:

I think that if the wire is heated up the atoms in the wire will start to vibrate because of their increase in energy. This causes more collisions between the electrons and the atoms as the atoms are moving into the path of the electrons. This increase in collisions means that there will be an increase in resistance.

"Material:

I think that the type of material of the wire will affect the amount of free electrons, which are able to flow through that wire. This is because the number of electrons depends on the amount of electrons in the outer energy shell of the atoms, so if there are more or larger atoms then there must be more electrons available. If the material has a high number of atoms there will be high numbers of electrons causing a lower resistance because of the increase in the number of electrons. Also if the atoms in the material are closely packed then the electrons will have more frequent collisions and the resistance will increase.

• ## Physics In Action – Hal Leonard (US)

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. ## Resistance Aim: my main aim is to investigate the factors that affect the resistance ...

3 star(s)

The electrons skip from atom to atom in the metal in retort to the electric field in the circuit. A conductor with a larger cross-section allows more electrons to relate with the field. Because there is more current with a given voltage, a conductor with a larger cross-section has lower resistance.

2. ## A Resistance Investigation - Independent Variables

All our results fitted with the general trend of the resistance being directly proportional to the length. I feel that from the evidence we collected that the data is good enough to support a firm conclusion. All the points are close to or on the line of best fit.

1. ## Investigating how the resistance of Nichrome wire depends on its length

This is almost double the 20cm resistance, so the proportionality is very direct that it proves my results only show a very small margin of error. I also stated that even voltage increases with resistance and this too has been proven; 0.772 average voltages for 20cm length and 0.965?, to

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

0.49 5.51 From these results I have chosen to use thin constantin for the wire I am going to use in my main experiment. I have chosen this wire as it has the highest resistance and so it will be easier to notice any difference in resistance in my main

1. ## Factors Affecting the Efficiency of a Wind Turbine

My hypothesis was correct in that the longer the blade the more productive a windturbine is. This is explained further in the diagram below. We can wrap up by saying that the length of blades should depend on wind area only to attain maximum efficiency.

2. ## An experiment to investigate the factors affecting the electrical resistance of a wire

using a micrometer in order to increase its realibility as the diameter of the wire would affects the results if it is not kept constant. Diameter of wire throughout the investigation: Analysis The graphs of different lengths of wire show that if the voltage increases, the current will increase as well.

1. ## An in Investigation into the Resistance of a Wire.

Copper is a better conductor than iron. When the electrons are moving through the metal structure they collide into the metal ions and this causes resistance to the electron flow or current. In different conductors the ease of flow of the electrons is different and so the conductors have different resistance.

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

To record the difference in widths I would use the same voltage and measure the resistance for each thickness. It would be easy to obtain these results so this would be my first test. For the temperature of the wire I would not be able to carry out a fair

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