• 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

# To find the affect of resistance of a piece of Nichrome wire.

Extracts from this document...

Introduction

Physics Electrical Resistance Coursework                 8163

## Hypothesis

I would assume that resistance occurs because 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. 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. If the length of the Nichrome wire is increased then the resistance will also increase as the electrons will have a longer distance to travel and so more collisions will occur. Due to this the length increase will be proportional to the resistance increase. I assume this because the longer the wire the more atoms and so the more likely the electrons are going to collide with the atoms. The increase in length is the increase in resistance, because the increase in length, will increase the number of atoms resulting in the increase of collisions slowing the electrons down and increasing resistance.

## Theory

The resistance of any wire depends on its length. This makes sense if you consider that however hard it is for electricity to flow through 1 metre of the wire, it must be twice as hard to flow through 2 metres and 3 times as hard to flow through 3 metres etc. As long as everything else about the wire remains the same (material, thickness and

Middle

The second crocodile clip is moved to the next position.

The above steps were completed for each length (10, 20,40,60,80 and 100cm) and then the entire experiment is repeated for accuracy, this was done for both test A and B as shown in my results table

Safety Precautions

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

1. Do not carry out the experiment in wet areas, as water is a very good conductor, and thus could be very dangerous.
2. Make sure the wire is not connected for long periods of time. This makes the wire   hot and destroys equipment.
3. Disconnect the wires should the ammeter reading go too high.

## Results Table

The table below shows two test results (result A result B) for the different lengths of wire tested on the voltage and current. The two voltages were added up and then divided by two, to give the average voltage. The same method was produced to receive the average current.

Conclusion

If I chose to measure the difference in the resistance in different materials I would chose a number of different materials and using the same voltage I would record the resistance given by each wire of the same length and width. Although once again it would be simple to record these results the graphs that could be drawn would not show any connection between the material and the resistance because of the limited number of materials I could test with the equipment available.

Wire width:

If the wires 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. If I were to choose this factor 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 constantan wire. To record the difference in widths I would use the same voltage and measure the resistance for each thickness. Although it would be easy to obtain and record the data the graphs that I would be able to draw up would not be interesting.

Page  of         28/04/07

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)

If I plot a graph to show how resistance varies with area, this will be shown: Unlike the graph for length, the line doesn't pass through the origin. However: R ? 1/A means that a graph of R against 1/A will show direct proportion.

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

But also when we re-positioned our crocodile clips to measure the other runs. It is almost impossible to position them in the exact same place as we did the first time, so we would get a slightly different length for each run of that particular measurement value which gave us random errors.

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

thickness is changed between 28, 30, 32, 34, 36, 38 and 40 swg. For both experiments the voltage will be kept the same at 2V dc from a power pack. Both experiments will be done twice with different ammeters in case of any damaged or old equipment to gain more accurate results.

2. ## How does length and width affect resistance

The correlation of the line 0.985981. This tells me that the results are all very close to the line of bets fit; therefore the results are very close to accurate. From this I learnt that my method was reliable and I decided to use the same method but for the real experiment I would experiment 10 lengths.

1. ## Copper, Constantan, Manganan and Nichrome - which is the best conductor?

The voltage will be measured in volts. Dependant Variables These are what I am going to measure in the investigation. During my investigation I will be measuring the ammeter. I chose to use it because it is a lot more accurate a digital meters, which was also available.

2. ## Investigation on the Resistance of Nichrome wire

The multimeter gives a direct measurement of resistance so therefore I think the multimeter will be more reliable and accurate. Method To do my experiment I will... 1) Set up the apparatus as shown in the diagram on page 1.

1. ## Does Increasing the Length of a Nichrome Wire affect its Resistance

For each length of wire I will collect data for I expect to find out that current and voltage will obey ohms law. Looking at my predicted graphs I would expect to see an upward trend on the line which will show a direct relationship between resistance and length as the line goes straight through 0.

2. ## Resistance of Nichrome Wire

As I am changing to variables the accuracy of my results is very important. To ensure the test is fair I will: * Make sure that the current in the circuit is always the same: To make sure the current is the same I will chose a certain current in which I will use in all circuits.

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