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# What factors affect the resistance of a wire?

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Introduction

What factors affect the resistance of a wire? Question How does the length of a wire affect its resistance? What is resistance? Resistance is a property of a material, which slows down or stops charge flow. When the electrons are flowing through the wire they can collide with each othe, causing resistance (the current to slow down). Variables * Temperature of room. If the wire is heated up the electrons in the wire will start to vibrate because of their increase in energy. This causes more collisions between the electrons as they are moving into the path of each other. This increase in collisions means that there will be an increase in resistance as it may slow them down. * Thickness of a wire. Resistance decreases if the cross-sectional area is increased. The narrow wire has fewer paths available for the electrons to move through. Whilst the larger wire has many more routes they could take. This makes the flow easier and less resistance to be caused. ...read more.

Middle

Safety * Make sure the circuit does not over heat by pursuing general safety and common sense when performing the experiment. * Make sure that the circuit is connected properly, to correct power points by double-checking the whole circuit before beginning the experiment. * Make sure no water comes into contact with the circuit by being careful and aware throughout the experiment. Fair test The only thing I will change in the whole experiment is the length of the wire. I will try and control every other variable. I will control the temperature of the room by making sure that I don't adjust anything so that the temperature is mainly constant, this isn't a perfect solution as it may differ by sunlight etc. however unfortunatly I don't have the facilities to control the temperature exactly. Results Length of wire (cm) Current (I) Voltage (v) Resistance (ohms) 10 0.50 0.14 0.28 20 0.46 0.14 0.3 30 0.45 0.16 0.36 40 0.41 0.23 0.56 50 0.4 0.29 0.73 60 0.4 0.31 0.78 70 0.39 0.39 0.87 80 0.55 0.5 1.43 90 0.3 0.51 1.7 Graph To Compare The ...read more.

Conclusion

The temperature increasing suddenly could give the electrons more energy therefore make the electrons move faster, making the chance of collision higher. The cause of the wire heating up could be due to the electrons moving therefore generating heat as a waste product, but also it could be due to the room heating up due to body heat or stronger sunlight suddenly coming apparent. This is something that could have been controlled with more controlled circumstances. I used an ammeter and a voltmeter with large scales which made my results clearer to read therefore more accurate, It is clear that my results go up steadily at each stage so they are reliable. If I was to repeat the experiment it would be more accurate, I would make the environment controlled and make sure that the test is fair by keeping all variables at a constant except for the length of the wire. I am pleased with the overall results that I achieved from the experiment it gave me a better understanding of how resistance is made. I got a proven and backed up answer to the original question from my set of accurate results. ...read more.

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