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# I am performing an experiment to find the piece of wire with the highest/ lowest conductivity, and the highest/ lowest resistance out of two samples. The two pieces of wire are Nickel Chrome and Constantin.

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Introduction

Science Coursework

Planning

I am performing an experiment to find the piece of wire with the highest/ lowest conductivity, and the highest/ lowest resistance out of two samples. The two pieces of wire are Nickel Chrome and Constantin. These two samples were also put into groups of length and size width. In this experiment we had to use a method of finding resistance.

Resistance = Voltage

Current

Prediction

Prediction: I think that in the length of the wire experiment, as the length of the wire increases so to will the resistance of it. My prediction for the thickness of the wire experiment is that the thicker the wire, the less resistance there will be.

Reason: My reason to back up my prediction for the length of wire experiment is that with electricity, the property that transforms electrical energy into heat energy, in opposing electrical current, is resistance. A property of the atoms of all conductors is that they have free electrons in the outer shell of their structure. So the longer the wire, the further the free electrons will have to travel, therefor the resistance will be greater as the wire is extended.

My reason to back up my Thickness of Wire experiment, is that using the same theory as above, the thicker the wire is, the more space the electrons have to move between. This means

Middle

Measurements needed:        Amps

Volts

Centimetres

Considering that in the ‘Length of Wire’ experiment, our strand of wire was 1 meter long and in 10cm segments, and there were 2 wire types, there was going to be a total of 20 measurements of Voltage, Amps and centimetres. In the thickness of the wire experiment, there were 2 wires, and 3 different thicknesses. Therefor there was a total of 6 measurements of Voltage and Amps, along with 6 equations to solve to find the resistance of each thickness. For the ‘Type of Wire’ experiment, we already had our measurements because we just had to use the same from the ‘Thickness of Wire’ experiment. So there were 6 measurements for this experiment aswell.

Plan of Investigation

We first took the apparatus and assembled them in the way as shown (on next page). To get our results we had to first make sure that the two crocodile clips were holding the wire exactly 1 meter apart, and then took the readings from both the Voltmeter and the Ammeter. Next we changed the distance of the crocodile clips to 90cm and took the readings. Then 80cm, 70cm, 60cm and so on until we got to 10cm giving us 10 different results for the wire each time making sure that the distance between the clips was as accurate as possible. Once we had acquired all of our readings for one wire we progressed onto the next wire.

We took 10m results for two wires and so moved onto the next experiment

Conclusion

Width

I found out that as the thickness of the wire increases, the resistance within the wire decreases. This is because the current has more space to move through when the wire is thicker. The electrons have more space to move from atom to atom instead of being compact into one thin wire where there isn’t as much space for electrons to move. Looking at my graph I can say that the relationship between the thickness of the wire, and the resistance against the current is not directly proportional. I can see this because on my graph the lines are not straight or reasonably straight, and they don’t pass through the point (0,0)

Type of Wire

I found out that from the two types of wire we tested, Constantin gave out the least amount of resistance against the current. This means that Constantin is the better electrical conductor out of the two wires. The reason behind this is that Constantin lets electrons from within the current flow easier through itself than Nickel Chrome does. I drew a bar chart to show this data, and from the three thicknessess I used of each wire, Constantin gave out the least resistance against current for every thickness apart from the thickest we used, which was 0.90cm

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