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Aim- To investigate the affect of changing the length of wire of resistance.

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Introduction

Science Coursework Planning > Title- Resistance of a wire > Aim- To investigate the affect of changing the length of wire of resistance. > Apparatus- * Crocodile wires * Wires; Copper, Aluminum * Amp meter * Volt meter * Battery > Method- 1) Attach your wires, crocodile clips, amp meter, voltmeter and battery as shown in the diagram above. 2) Turn on power of the battery 3) ...read more.

Middle

Aluminum will have a higher resistance because it is not such a good conductor and is not usually used for conducting. Observation > Result table Aluminum Length (cm) Volts Amps Resistance (?) 40 0.39 0.36 1.08 30 0.34 0.31 1.1 20 0.29 0.16 1.81 10 0.16 0.14 1.14 Copper Length (cm) Volts Amps Resistance (?) 40 0.38 0.43 0.88 30 0.31 0.28 0.85 20 0.21 0.17 1.23 10 0.2 0.09 2.2 > Analysis Aluminum Copper > Evaluation This experiment was very limited and could not find enough data on the experiment and is therefore not very accurate. ...read more.

Conclusion

Silver has the lowest resistance of all metals but is very expensive, that is why copper is used. Aluminum is the fourth lowest resistance after silver, copper and gold. Aluminum is not used for electric wires because copper is cheaper and a better conductor. When we changed the lengths of the wires it seemed that the resistance became lower and the wires got hotter. This is because the electricity has to pass through less wire. The experiment could have been more accurate if I used the same amount of electricity each time. ...read more.

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