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# Investigating One Factor That Affects The Resistance Of A Wire, Given One Cell.

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Introduction

Investigating One Factor That Affects The Resistance Of A Wire, Given One Cell

## Planning

I am going to investigate how changing the thickness of a wire affects the wire’s resistance, given one cell. From my current scientific knowledge, I predict that the thicker the wire, the lower the resistance. The thicker wire has more space for the electrons to go through, but in a thinner wire, the current would have to squeeze through a smaller space, giving it a higher resistance. It’s like a road; on a motorway (which is like the thicker wire), the cars (which are like electrons) can go down three lanes and therefore move faster and more efficiently (which is like low resistance). In a lane, however, there is only one lane for the cars to go down, so they move in single file, which is slower and less efficient. This can cause queues, which is like high resistance because they are blocking up. Also, previous experiments I have done in science have shown me that the thicker the wire, the higher the current, and I have learnt that the larger the current that passes through the wire, the lower the resistance.

Middle

## Obtaining Evidence

My method has remained the same, and here are my results of each investigation.

1st Investigation

 Wire Thickness Current (A) Voltage (V) Resistance (Ω) 0.25mm 0.20 0.95 4.75 0.34mm 0.54 0.63 1.16 0.45mm 0.62 0.48 0.77 0.69mm 0.50 0.29 0.58 0.74mm 1.10 0.20 0.18

2nd Investigation

 Wire Thickness Current (A) Voltage (V) Resistance (Ω) 0.25mm 0.21 0.84 4.00 0.34mm 0.54 0.59 1.09 0.45mm 0.65 0.49 0.75 0.69mm 0.50 0.29 0.58 0.74mm 1.08 0.24 0.22

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Conclusion

My results, besides the odd 0.69mm result, are accurate, follow the trend I predicted, that the thicker the wire, the lower the resistance. I could predict this from my scientific knowledge that if a small current passes for a given potential difference, the resistance will be high, and vice versa. This also applies to thickness of the wire, which is how I could make my prediction.

## Evaluation

If I was to repeat my investigation, I think taking more care in recording my results would be the main change I would make to correct the anomalous result I got for the 0.69mm wire. I think my method was quite reliable, and accurate because only one result was odd, and even then, it was not far off the line of best fit and the result still fitted in with my conclusion and trend. Therefore, my results, despite the one anomalous result, are good enough to support a firm conclusion.

## Conclusion

The thicker the wire, the lower the resistance.

Vicky Cannam 10c

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