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# IB Physics HL - Relationship between thickness and Resistance of a wire

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Introduction

IB Physics HL - Relationship between thickness and Resistance of a wire Aim To investigate the relationship between thickness and Resistance of a wire Hypothesis When the wire is getting thicker, there are more routs for electrons flow that means increases of ampere. Resistance is inversely proportional with ampere. Therefore, I think the resistance is inversely proportional with thickness of a wire. Variables Independence: Thickness of a wire Dependence: Resistance of a wire Controlled variables: length of a wire, type of a wire, and voltage from power supply Method Set the voltage from power supply to 6V Set the length of a wire to 40cm. ...read more.

Middle

SWG Diameter (mm) 1 2 3 Av 1 2 3 Av 18 1.219 5.84 5.83 5.84 5.84 2.5 2.49 2.48 2.49 0.43 20 0.914 3.93 3.92 3.92 3.92 2.95 2.97 2.98 2.97 0.76 24 0.559 1.82 1.83 1.82 1.82 3.4 3.41 3.42 3.41 1.87 26 0.457 1.22 1.21 1.22 1.22 3.66 3.67 3.65 3.66 3.01 32 0.274 0.53 0.52 0.53 0.53 3.84 3.82 3.83 3.83 7.27 36 0.193 0.24 0.24 0.24 0.24 3.9 3.91 3.93 3.91 16.31 38 0.152 0.14 0.15 0.15 0.15 3.98 4 3.99 3.99 27.20 Conclusion As you can see in the graph, when the diameter of a wire is getting smaller which means a wire is getting thinner, the resistance goes up. ...read more.

Conclusion

However, one thing I just want to mention is, when we deal with 18 SWG and 20SWG wire, the wire gets really hot even we could smell something burning. Although we set the length of a wire to 40cm, it wasn't enough for thick wire such as 18 SWG and 20SWG wire. Another small problem was the wires weren't straight. So the length of a wire might be inaccurate, it could be effects to get an accurate value for resistance of wire. Especially, thick wire was really hard to make it straight. Suggestions Solution for first problem is, do the experiment in the water, because water can remain cool. But it seems to be a dangerous. Solution for second problem is, use the hammer, this solution seem to be useful for only thick wire. ?? ?? ?? ?? ...read more.

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