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# To find the factors that affect the resistance of a solder wire.

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Introduction

Physics Coursework Aim: To find the factors that affect the resistance of a solder wire. Planning The factors which may affect the resistance are: -The length of the wire -The temperature of the wire -The diameter of the wire Background Theory The "molecules" of metals are usually single atoms and these are held together by electrical forces. These forces involve the sharing of electrons and these electrons are free to move at random within the metal. So metal consists of ions rather than atoms. Under the action of an applied voltage, the electrons drift through the metal. It is not a steady motion since the electrons are continually colliding with the ions, they start and stop and start and stop again. ...read more.

Middle

The law does not apply when heat is involved. The formulae are as follows. V= I x R I= V � R R= V � I Prediction If we increase the surface area the resistance will decrease. For example, if you double the cross-sectional area the resistance will be halved. A diagram of the apparatus Fair Test Throughout the investigation each of the following will be kept constant: -Temperature - 21�C -Length of wire - 117 cm -Material - Solder wire Number of Measurements I plan to investigate how the resistance varies with solder wire. I will repeat the readings and then calculate the average reading for each wire. ...read more.

Conclusion

So the applied voltage will be able to affect 4 times the number of electrons, i.e. the current increases and the resistance decreases. The scatter-graph. The vertical part is in Volts and the horizontal part is in Cm's. This graph shows a straight-line correlation between cm's and volts. What is the resistance of the wire? Resistance Volts � Amps Resistance 2.99 � 0.58 Resistance 5.16? Are my results accurate? I don't think my measurements will be very accurate because it did no have an accurate measure of centimetres. Also the crocodile clip covered 0.5cm's and the wire was not tight. The volts and amps were accurate to 2 decimal places. ?? ?? ?? ?? Peter Vaughan Year 10 - 4 - ...read more.

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