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Our aim is to investigate how the resistance of a know conductorconstantan varies with length.

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Introduction

GCSE Physics Coursework Resistance of a Wire Aim: Our aim is to investigate how the resistance of a know conductor constantan varies with length. Background information: When electricity is conducted through a conductor, in this case a wire, the number of free electrons determines how much resistance there is, i.e more free moving electrons means less resistance. The free electrons are given energy and move and collide with other electrons; this happens across the length of the wire and electricity is conducted. Resistance is the result of energy loss as heat. The resistance is calculate by measuring the current in the circuit and the voltage across the wire. These measurements are then put into this formula: V = I * R V = Voltage I = Current R = Resistance Ohm's Law states that the current through a conductor at a constant temperature is proportional to the potential difference. ...read more.

Middle

We attached the voltmeter to the 3cm marking and recorded the voltage; we then did the same at 6cm and so on. Safety: In order to carry out a safe experiment we chose a low voltage of 9V to minimise overheating. We were careful to not touch the wire whilst we were recording data, because the wire might have been hot. Results: Length of Wire (cm) Voltage Amps 3 0.7 0.6 6 1.2 0.6 9 1.6 0.6 12 1.9 0.6 15 2.3 0.6 18 2.7 0.6 21 3 0.6 24 3.4 0.6 27 3.8 0.6 30 4.2 0.6 33 4.6 0.6 36 4.9 0.6 39 5.3 0.6 42 5.7 0.6 45 6.1 0.6 48 6.4 0.6 51 6.8 0.6 54 7.2 0.6 We then repeated our experiment Length of Wire (cm) Voltage Amps 3 0.7 0.6 6 1.2 0.6 9 1.6 0.6 12 2 0.6 15 2.3 0.6 18 2.7 0.6 21 3.1 0.6 24 3.5 0.6 27 3.8 0.6 30 4.3 ...read more.

Conclusion

Evaluation: From my results table and graph I can see that my results that I collected are very reliable. I know this because my results table does not show any individual irregular results this means that I did not have to leave any results out of my averages because they were irregular. To improve on my results I would use a digital voltmeter instead of an analogue meter. I would do this because a digital voltmeter is a lot more accurate than an analogue because if the needle in the analogue voltmeter is bent then the readings given off will be false whereas a digital voltmeter does not rely on a needle or any other manual movements. As well as making this modification I would also improve my Investigation by testing the same wire but different widths of that wire. I would do this to expand on my Investigation. ...read more.

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