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# Fuse Wire.

Extracts from this document...

Introduction

Fuse Wire

Investigating one of the factors that affect the current at which a fuse blows. Also I will identify and control other factors that might have an effect.

Aim:

To investigate how increasing the length of a fuse wire affects the heat production in a fuse wire, as the length is increased.

Preliminary Work:

 Wire diameter 0.05mmCurrent (A) Wire Diameter 0.10mmCurrent (A) Length (mm) 1 2 3(Average) 1 2 3(Average) 5 1.18 1.16 1.17 2.18 2.11       2.19 2.19 10 0.82 0.85 0.84 2.00 2.03 2.02 20 0.63 0.56       1.61 0.62 1.82 1.79 1.81 50 0.44 0.40 0.42 1.63 1.55       1.61 1.62 100 0.18 0.29       0.19 0.19 1.60 1.20 1.4

The greater the length of the wire,

Which causes a greater resistance,

Causing a greater rate of heat production,

Leading to less current needed to melt the fuse wire.

Prediction:

I predict that

Middle

Variables / Factors:

•  The length of the fuse wire – 1mm going to increase this, starting from 10mm, increasing it in the steps of 10mm up to 100mm.
• There is a variable that I need to keep the same.

The diameter of the fuse wire – 0.10mm.

The material of the fuse wire - copper

Diagram:

Method:

• I will set up the apparatus up as shown.
• I will ensure that I use the fuse wires over the range that I have described in my variables.
• I will ensure that I keep the diameter of the fuse wire the same – 0.10mm.
• Then I will test the fuse wire, by applying current through it until the fuse wire melts.
• Then I will record the time.
• Lastly I will do repeats to ensure that I have obtained accurate and reliable results.

Conclusion

I can improve the experiment by avoiding anomalies. Anomalies can be avoided by using a more accurate stopwatch (measuring to microseconds) and by being more aware and careful when using the stopwatch. I can also use alternative clips rather than crocodile clips, to ensure that heat loss only occurs through the wire. I can use aluminium clips, which are made of a better conducting material than the material of crocodile clips. The advantage of using a better conducting material is that it consists of more free moving electrons, which are able to transfer thermal energy more quickly throughout the piece of metal. Therefore I will obtain more accurate and reliable results.

Overall, I believe that this experiment was suitable for this task, as it supported the scientific knowledge and my prediction. Therefore I was able to obtain reliable and accurate results.

In the future I will ensure that any anomalies are rectified or omitted by repeating the anomalies under the same conditions and then calculating the averages.

Waqas Riaz 4PAC

This student written piece of work is one of many that can be found in our GCSE Electricity and Magnetism section.

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