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To investigate how the length of wire in a current affects the flow of current.

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Introduction

Planning Chris Doddington Aim To investigate how the length of wire in a current affects the flow of current. Prediction I predict that the longer the wire is the lower the current will be. This is because there are more particles in the wire and so a longer wire will have lots more particles in the way, this will reduce the current. So in a short wire the current will be high. Resistance is a part to, the longer the wire the more resistance there is, so less current. Here is a diagram that shows two wires, short and long. The current has to 'bounce off' more positive ions, this causes more resistance and so the current is lower. Predicted graph Here is what I believe the shape of the graph will look like when I have my results. This graph shows that the longer the wire the lower the current. Diagram Apparatus Here is a list of the equipment I will be using: Powerpack Ammeter Voltmeter Wires Metre rule Crocodile clips Thermometer Nichrome wire Safety The experiment can be dangerous if it is not done safely. I will do the following to ensure that I remain safe in the experiment at all times. * Keep the temperature of the wire low so it doesn't burn. ...read more.

Middle

I took the equipment apart and then put it back together, see why in fair testing. 5) When I finished run two I did the same again and did a third run. 6) I put all my results on to a table and calculated the average. Fair testing For this experiment I had to make sure it was fair or my results would be wrong. Here is how I made it a fair test: * Temperature was kept low: I did this by using a low voltage and I turned the powerpack off after every reading so it wouldn't too hot. If the temperature get too hot then the reading become different and so the experiment would be wrong. * Length of wire: I made sure then the wire didn't slip out of the masking tape, this is because if it did the wire wouldn't be straight then there is more wire of the current to get to through so change the current reading. * Taking the equipment apart: after every run I took the equipment apart and then re-assembled it. I did this because if I had set the experiment up wrong then I would notice in the next run. * Keeping the voltage the same: I did this to ensure that the volts going in to the wire remained the same, if I didn't then the current reading would have changed. ...read more.

Conclusion

These anomylies could have been for a number of reasons: * Voltage wasn't quite on two volts. * The temperatures were higher or lower that usual. * Crocodile clips were not on the number as precise as it should be. I think that the procedure was very good, but if I could change one thing it would be to wrap the wire around the thermometer this would give me more accurate results for my temperature readings. I believe that the evidence I have does support my prediction, but a further two runs would have been helpful. If I were to continue with this experiment I would use copper wire. I think that the copper wire would offer less resistance because all electrical wires are made from copper, as it is more efficient. I would then continue trying other wires made from different materials to see which is the best and worst at conducting current well. Other ways to extend my experiment are as followed: * Use ammeters and voltmeters to 3 decimal places: this would give me more precise results. * Width: this would give me new results. * Temperature: this would lower the current as the ions are moving more. * Type of metal: different metals have different resistance so the current reading would change. On this experiment I could see which wire offers less resistance and so would be more economical. ...read more.

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