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How Does the Length of a Wire Affect Its Resistance?

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Introduction

HOW DOES THE LENGTH OF A WIRE AFFECT ITS RESISTANCE? INTRODUCTION Resistance is the property that transforms electrical energy into heat energy, in opposing electrical current. A good conductor has a low resistance and a poor conductor has high resistance. The resistance of a wire of a certain material 1. increases as its cross-section area decreases, 2. depends on the material AIM My aim is to find how the electrical resistance of a wire changes in relationship to its length. PREDICTION My prediction is that if the length of a wire increases the resistance increases. I also predict that the rate at which the resistance of the wire increases will be directly proportional to the length. I predict this using the idea of free electrons, a property of the atoms of all conductors is that they have free ...read more.

Middle

The width of the wire: if the wire were thick, then the free electrons would have more room to move about and so therefore they would be able to move faster towards the positive end, and so the resistance would be low. So I have to make sure that I use the same wire, because it could effect the outcome. 2. The temperature: I must keep the surrounding room temperature the same, because if it is hot in the room then the free electrons can pick up energy, which could help them move faster and so the resistance would be effected. 3. The material of the wire: 4. The current: the current that we pass through the wire is to be kept the same, because if the current is high then this will make the free electrons move faster, therefore it will effect the resistance. ...read more.

Conclusion

Current (a) Resistance Average resistance 10 0.1 0.4 0.25 0.41 10 0.2 0.4 0.5 10 0.2 0.5 0.4 10 0.3 0.6 0.5 20 0.2 0.4 0.5 0.80 20 0.3 0.4 0.75 20 0.4 0.5 0.8 20 0.7 0.6 1.17 30 0.3 0.3 1 1 30 0.4 0.4 1 30 0.5 0.5 1 30 0.6 0.6 1 40 0.4 0.3 1.3 1.46 40 0.6 0.4 1.5 40 0.8 0.5 1.6 40 1 0.7 1.4 50 0.4 0.3 2.5 1.31 50 0.5 0.4 1.25 50 0.7 0.5 1.4 50 0.9 0.7 1.3 60 0.3 0.15 2 2.95 60 0.5 0.2 2.5 60 0.6 0.3 2 60 1.5 0.6 2.5 70 0.35 0.1 3.5 2.27 70 0.5 0.2 2.5 70 0.75 0.3 2.5 70 1.25 0.5 2.5 80 0.45 0.1 4.5 2.99 80 0.6 0.2 3 80 0.7 0.25 2.8 80 1.45 0.6 2.42 90 0.4 0.15 2.67 2.46 90 0.6 0.2 3 90 0.85 0.3 1.7 90 1.6 0.6 2.67 ...read more.

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