• 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

# Investigate how the length of a wire affects the current and resistance of a wire.

Extracts from this document...

Introduction

Physics Courswork – The Resistance of a Wire

Aim:

Investigate how the length of a wire affects the current and resistance of a wire.

## Prediction and Background Information

I think as you increase the length of the Constatan wire, you also increase the amount of resistance. The current is the flow of electrons; the current is dependent on the amount of voltage, which is applied. Voltage is the push given to the current. Resistance occurs when the electrons travelling along the wire collide with the atoms of the wire. These collisions slow down the flow of electrons causing resistance. Resistance is a measure of how hard it is to move the electrons through 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 and the resistance should be directly proportional. This is because in a wire twice the length of another wire there would be double the amount of atoms causing the resistance.

Middle

Resisitance is measured in omegas (Ω). The formula for this is:

Resistance (Ω) = Voltage (V) / Current (Amps)

e.g If voltage is 0.13 and current is 0.3 then 0.13 / 0.3 = 0.43 Ω

Equipment List

• Constatan wire
• Power Supply
• Connecting Wires
• Two Crocodile Clips
• Voltmeter
• Ammeter

Safety Precauitions:

This is not a very dangerous experiment but despite this you must always handle electricity with care, keep the current low, handle with dry hands etc.

Accuracy / Fair Test:

To keep this experiment as accurate as possible I need to make sure, firstly, that the length of the wire is measured precisely from the inside edge of the crocodile clips, making sure that the wire is straight when we do this. We must also make sure that the wire is straight when we conduct the experiment. If it is not, short circuits may occur may effect the resistance, also. The reading that we take of the voltage should be done fairly promptly after the circuit is connected.

Conclusion

Most errors in my experiment were encountered in the measuring of the wire. This is because it simply was not very practical to hold a piece of wire straight, whilst holding it next to a ruler and then trying to accurately fix crocodile clips to the right part on the wire. Also I do not feel that the crocodile clips were always fixed securely to the wire. This also meant that they were easy to move about on the wire changing the length of it. Errors rarely occurred in the setting of the current and the reading of the voltage.. Another example of this is the wire was never totally straight when I started the experiment, which may also, as said earlier on, effect the resistance of it.

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. ## Investigating how the length of a Wire affects its resistance.

A range from 10cm to 100cm is practical yet easy to spot changes and reliable. 30 measurements will be made altogether. This is 10 actual changes of length: 10cm to 100cm in 10cm increments and 3 repeats. 10 changes in length are used because too big a difference in lengths (i.e.

2. ## To Investigate the Relationship between the Resistance and the Length of a Wire

0.10 0.12 1.20 0.15 0.16 1.07 0.20 0.22 1.10 0.25 0.28 1.12 0.30 0.34 1.13 0.35 0.39 1.11 Mean Resistance, x = 1.12 Table 6e Result from Pilot Experiment 2: Nichrome: 10.0 cm 30swg Current, A Voltage, V Resistance, ?

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

The potential difference across a circuit component measures the amount of energy that is transferred to that component as current flows through it. When the voltage is increased, the current increases too. Voltage ? Current V ? I In my investigation, I am going to keep every controllable variable constant except for length.

2. ## Investigation: How length affects the resistance in a wire.

drop, as the electrons have a larger area to flow through, thus there will be a smaller ratio of resistance, tot area. This will mean there will be a negative correlation between width and resistance. Strategy: To ensure that I have accurate and reliable results, I have devised a strategy, to make sure everything is done/set up properly.

1. ## I am trying to investigate the factors, which affect the current in a wire.

The pages were page 246- 250 chapter 31 which was on circuits, then from page 251- 256 which was on Resistance, then page 257 which was on current. The second textbook that I got my research from was 'Steps in Physics' by John Byron.

2. ## To investigate how the length of a wire affects its resistance.

This would in turn double the amount of atoms that the electrons would collide with and then resistance would double. Apparatus To complete my experiment fully, I shall use the following apparatus: * Power pack * Voltmeter * Ammeter * Crocodile clips * Wire * 100cm ruler Safety Although this

1. ## To investigate how the length of wire in a current affects the flow of ...

This is what the diagram shows. But if the wire is longer then resistance lowers the current, this is because the current has to 'bounce off' more particles in the wire. Temperature If the temperature in the wire is hot then the positive ions will move around more and so this will cause more resistance.

2. ## To Investigate How Length Affects the Resistance of a Length of Wire.

The free electrons are given energy and as a result move and collide with neighbouring 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, other free electrons, and impurities.

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