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# Investigating the current through a wire.

Extracts from this document...

Introduction

Investigating the current through a wire

Aim:

I am investigating how the length of a wire affects the current and resistance of a wire.

Apparatus:
1. power supply of 2 V

2. Ammeter

3. Voltmeter

4. Circuit Wires

5. Nichrome Wire

6. A meter ruler

7. Sellotape

8. Digital Voltmeter

9. Crocodile Clips

Diagram:

Detailed Method:

I will set up the circuit as shown in the diagram above.

Then I will start the experiment by attaching the 100 cm of nichrome wire to the metre ruler carefully, so there are no twists in the wire, which would affect the exactness of my results.

Then I will switch on the power supply and make sure that a constant voltage is flowing through the circuit.

I will then record the current flowing through the wire from a digital ………….. using different lengths.
I will record the current every 10 cm. From a 100 cm down to a 90cm From 90cm down to 80cm, from 80cm down to 70cm, from 70cm down to 60cm, from 60cm down to 50cm, from 50cm down to 40cm, from 40cm down to 30cm, from 30cm down to 20cm, from 20cm down to 10cm.

Middle

90

2

0.19, 0.18, 0.19, 0.18, 0.19

10.52, 11.11, 10.52, 11.11, 10.52

100

2

0.16, 0.16, 0.17, 0.17, 0.16

12.50, 12.50, 1176, 11.76, 12.50

Now I will put the results of the thinner wire in a table

Results of the thinner wire

 Length in cm Voltage in V Current in A Resistance in Ohms 10 1 0.30, 0.30, 0.31, 0.29, 0.31 3.33, 3.33, 3.22, 3.44, 3.22 20 1 0.19, 0.19, 0.20, 0.20, 0.20, 5.26, 5.26, 5.00, 5.00, 5.00 30 1 0.15, 0.14, 0.15, 0.15, 0.15 6.66, 7.14, 6.67, 6.67, 6.67 40 1 0.12, 0.11, 0.12, 0.11, 0.12 8.33, 90.9, 8.33, 9.09, 8.33 50 1 0.10, 0.10, 0.10, 0.10, 0.10 10.00, 10.00, 10.00, 10.00, 10.00 60 1 0.07, 0.09, 0.09, 0.09, 0.08 14.28, 11.11, 11.11, 11.11, 12.50 70 1 0.07, 0.09, 0.07, 0.08, 0.07 14.2811.11, 14.28, 12.50, 14.28 80 1 0.07, 0.07, 0.06, 0.07, 0.07 14.2814.28, 16.67, 14.28, 14.28 90 1 0.06, 0.05, 0.06, 0.06, 0.06 16.67, 20.00, 16.67, 16.67, 16.67 100 1 0.05, 0.05, 0.05, 0.05, 0.05 20.00, 20.00, 20.00, 20.00, 20.00

I will now calculate the average current and resistance for each length and then draw a graph with these results.

Conclusion

Also I do not think that the crocodile clips were always connected correctly to the wire with a good connection. This also meant that they were easy to move around on the wire changing the length of it

It was hard for me to read the Current since it changed between two numbers on the ammeter. It took a long time until I could decide on the final current, which affected the accuracy of my result again, since the wire got hotter.

I don’t think that taking any more results could have made them more accurate.

I could have improved my results by writing down the change in voltage and see how it affects my results, or taking the measurements every 5 cm.

Further experiments I could have done related to the resistance of a wire could be to see whether the material would make a difference in the resistance of a wire.

I don’t think I could really improve on the way the experiment was done.

I also found that the experiment was quite easy to set up, as it was simple and uncomplicated.

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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