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# Test the resistance of a wire, (nicrome) measured in SWG/mm, to find out if resistance changes as we change the length of the wire.

Extracts from this document...

Introduction

## P- Planning

• Plan basic experiment
• Control variables
• What accurate
• Make prediction (hypothesis) with scientific information.
• Evidence of preliminary work.

Outline Plan

## Aim

-Experiment one - To test the resistance of a wire, (nicrome) measured in SWG/mm, to find out if resistance changes as we change the length of the wire.

-Experiment two – To test the resistance of a wire (nicrome) to see if the resistance changes as we change the area of the wire.

Middle

35.0cm

03.8

03.6

03.6

03.7

45.0cm

04.6

04.6

04.6

04.6

55.0cm

05.7

05.7

05.6

05.7

AREA (with constant length of 20cm)

 Diameter(cm) V1(volts) V2 (volts) V3(volts) C1 (amps) C2 (amps) C3 (amps) 0.027 0.23 0.37 0.88 0.05 0.09 0.21 0.031 0.18 0.34 0.80 0.06 0.11 0.27 0.037 0.12 0.22 0.68 0.06 0.11 0.34 0.045 0.09 0.15 0.58 0.06 0.10 0.40 0.055 0.06 0.11 0.46 0.06 0.11 0.48

*V=Voltage

*C=Current

Calculate resistance…

Conclusion

Graph Three – Resistance over 1/area

As the area increases, the resistance goes down, but not at a steady pace. The graph is curved and in a result is not proportional.

I then plotted a graph of resistance over the inverse of the area to make it proportional. It turned out a straight line therefore proving resistance is inversely proportional to the area.

During my experiment, I did not need to repeat any anomalous results because they were between an acceptable margin of error.

###### E – Evaluation

My experiment went not to badly yet I did struggle with the resistivity. My results came out fairly accurately when I did repeats and came to look at my graphs and final figures.

When averaging out my final results to compare them to the published resistivity, I found one of my final results were very far out. This may hav been because it was the smallest length therefore the current may have been high causing the wire to heat up. When the wire heats up the particles vibrates more. Next time, I will not take readings at 5.0 cm and I will keep the voltage low. I left ths result out when averaging it out

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