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My investigation was to find the resistance of a wire, by measuring the voltage and current that passes through it. This was done with different lengths of wire. And by using the formula:R = V I

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Introduction

My investigation was to find the resistance of a wire, by measuring the voltage and current that passes through it. This was done with different lengths of wire. And by using the formula: R = V � I PREDICTION I predict that the longer the piece of wire, the greater the resistance will be. This is due to the free moving electrons being resisted by the atoms in the wire. In a longer piece of wire, there would be more atoms for the electrons to collide with and so the resistance would be greater. ...read more.

Middle

.10 .10 .11 0.10 0.36 0.35 0.34 0.35 1 M .09 .08 .08 0.08 0.29 0.28 0.28 0.28 0.5 M .05 .06 .05 0.05 0.19 0.21 0.20 0.20 RESISTANCE = 3m - 3.2 2.5m - 2.6 2m - 1.7 1.5m - 3.5 1m - 3.5 0.5m - 4 VARIABLES LENGTH OF WIRE - the longer the piece of wire, a higher resistance will be found. This is because electrons collide with the wire particles. The further it has to go the more particles it will collide with, so the resistance will be greater. THICKNESS OF WIRE - the thicker the wire the lower the resistance. ...read more.

Conclusion

The only variable in the test I will be performing will be the length of the wire. The wire must be pulled tight against the ruler and taped in place to ensure the length is accurately measured. The experiment should be repeated 2 or 3 times and an average taken to make sure that the results are reliable. EQUIPMENT � Power supply � Ammeter � Digital voltmeter � Crocodile clips (x3) � Meter ruler � Wire (3 meters) � Leads/connectors (x7) � Variable resistor PLAN 1. Set up equipment 2. Attach the appropriate length of wire to the clips 3. Measure the current and voltage 4. Repeat this 2 or 3 times 5. Record data in a table 6. Calculate the resistance of the wire Richard Coleman 11R ...read more.

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