• 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

# Investigation into the resistant in wires.

Extracts from this document...

Introduction

Physics SC1 Oliver lamb Investigation into the resistant in wires Aim: to investigate how the length of a wire affects the resistance. Apparatus: Wire (SWG 25) Ammeter Power source 4v Crocodile clip Variable resister Meter ruler Voltmeter Leads Method: Set up the apparatus as shown in the circuit diagram below. The length of the wire is changed between 0cm and 100cm at 5cm intervals. The current needs to be kept at a constant of 0.3 amps throughout the experiment and the voltage across the wire at each length of wire is recorded. The experiment is repeated 3 times with each length of wire, and an average obtained. If any obvious anomalies occur, then these are repeated also. Prediction: I predict that the longer the wire, then the greater the resistance. Conductivity of a metal depends on the numbers of free electrons, which are contained within it. The more free electrons, the more conductive the metal is, as the free electrons are given energy and then collide with neighbouring free electrons. This happens throughout the wire and electricity is conducted. Resistance is a result of energy lost as heat, and is measured of how much is lost in this way. Free electrons colliding with fixed particles within the metal, other free electrons and impurities cause the loss of energy. ...read more.

Middle

40 0.3 1.02 1.01 1 1 45 0.3 1.14 1.15 1.14 1.143 50 0.3 1.32 1.32 1.33 1.333 55 0.3 1.4 1.4 1.4 1.4 60 0.3 1.56 1.56 1.57 1.563 65 0.3 1.66 1.67 1.65 1.663 70 0.3 1.8 1.81 1.8 1.803 75 0.3 1.92 1.91 1.92 1.923 80 0.3 2 2 2.1 2.003 85 0.3 2.15 2.14 2.15 2.153 90 0.3 2.34 2.34 2.34 2.34 95 0.3 2.45 2.45 2.46 2.453 100 0.3 2.56 2.56 2.56 2.56 Observations: We will observe the reading on the voltmeter change as we change the current to .3 A. we also observe a general increase in the voltage as the length of wire we use gets longer. The variable resistor will also be set at different positions for the different lengths of wire that we use. To make sure our overall values are as accurate as possible we will repeat our readings 3 times and then take the mean resistance of the 3 readings. We will also be able to spot and Analysis Trends: From the graph we can see one very clear trend, which is, as the length of the wire increases so does the resistance of it. Another, more significant thing is that it the increase is constant. ...read more.

Conclusion

Most errors in our 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 with a good connection. 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. It was just in the preparation area that they did occur. Another example of this is the wire was never totally straight when we started the experiment, which may also, as said earlier on, affect the resistance of it. I do not think that doing any more results in our experiment would have made it any more accurate. I feel that the only way to make it more accurate would be to use a different method - perhaps were we had a bar that did not bend in place of the wire. We could even use a rheostat in place of the wire, because it is essentially a long coiled wire that is connected at different lengths to change the resistance of the circuit ...read more.

The above preview is unformatted text

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. ## Investigation in resistance in wires

5 star(s)

To work out A I need to work out the radius of my wire length The diameter was 0.2mm 0.2/2 = Radius Radius = 0.1mm A = ?r� A = ? x 0.1� A = 3.14 x 10^-6 m� By plotting the average resistance against length on a line graph

2. ## Resistance of a Wire Investigation

As light intensity increases further, so the rate of photosynthesis is being limited by other factors more and more, until the rate of photosynthesis is constant, and so is almost certainly limited in full by another factor. Overall, both graphs and my results support my predictions fully.

1. ## Investigate the resistance of different wires and how at different lengths the voltage increases ...

me data that had no other variable then the length so the temperature wasn't an issue. Expanding my investigation As well as making these modifications, I could also expand on my investigation by testing the same wire but different widths of that wire.

2. ## Resistance and Wires

This is also shown as the increase of resistance every 10cm is the same. The graph indicates an increase of 1.5ohms every 10cm. So for every 10cm of nickel-chrome wire with a diameter of 34mm, 1.5ohms of resistance is added on.

1. ## Investigate one or more factors affecting the resistance of metal wires

Steps 4 and 5 were repeated - each time I increased the wire length by 10cm until the length of the wire was 100cm, which was my last reading. (Note that I started taking readings at the shorter lengths of wire and gradually increased to the longer lengths because

2. ## Resistance of wires

Method of Investigation It is important to record the method of how I carried out the practical as it is useful for explanation. (To make the experimental setup easier to understand and get a better picture of, here (below) is a labelled diagram which shows the required circuit for the

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