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Investigate a factor which will affect, the resistance of wire.

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Introduction

Aim: - to investigate a factor which will affect, the resistance of wire. There are four different factors we could choose to vary:- 1. Thickness/diameter of the wire 2. Length of wire 3. Material of wire 4. temperature of wire We decided to change the factor length because it allows us to get continuous data in a large range. It is also the easiest to vary. I decided against Diameter of wire because it is hard to compare to resistance (they cannot be plotted against one another because as resistance goes up the thickness goes down), I also decided not to vary the material the wire is made of because it would give us discrete data which is hard to analyse. Temperature is a very bad variable because it is so hard to control; the circuit will increase in temperature whatever I do, so I need to take that into account. RESISTANCE Resistance is anything in the circuit which slows the flow down. ...read more.

Middle

FAIR TEST To make sure the investigation is fair, we will use the same equipment each time, monitor the temperature (if the wire start to give off smoke we will stop and give it time to cool down to reduce anomalies) and we will measure our wire using a micrometer to check the width before doing any equations. EQUIPEMENT Power pack, to power our experiment so current flows through the wire. Ammeter, to measure the current flowing round our circuit. Voltmeter, to measure the voltage of our circuit. 1m Nicrome Wire, to test. Wire, to put, our circuit together with. Metre rule, to measure the lengths of wires. Crocodile clips, to hold wires in place. DIAGRAM METHOD 1. set up apparatus as above 2. Put crocodile clips at 0mm and 900mm 3. Turn power pack on 4. record Current and Volts 5. Turn off Power pack 6. Repeat steps 1-4 7. Repeat steps 2-6 but with 800mm.700mm, 600mm,500mm,400mm,300mm,200mm and 100mm We can clearly see my results are correct because the constant is constant. ...read more.

Conclusion

Our preliminary experiments allowed us to make sure the wire did not get too hot which meant we did not get any anomalies around 100mm and that we were safer. I think our range was big enough but if we had more time I would have liked to done another repeat and possibly take measurements at 50mm intervals to achieve a greater range of results. I thought our results were really good they clearly supported our prediction that as length increases so does resistance. If I was to further this experiment I would use different metals and see which had the best resistivity, I would not use a metre rule because it was easy for human error to occur as it was not particularly detailed perhaps a digital measuring device would have been better. I might also try a different variable such as diameter of wire to see how that affected the resistance. Overall I was very pleased with our investigation and think that we did all we could to do it well. Physics Coursework Tuesday 13th January 2004 Stephanie Muzzall 11I 1 ...read more.

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