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# To find out how the length of a piece of wire effects the reaction time in a circuit.

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Introduction

Physics Coursework. Planning: Aim: To find out how the length of a piece of wire effects the reaction time in a circuit. Background and general information: In this course work investigation I will be trying to find out if the length of a piece of wire which is joined into a circuit effects the resistance. There is many reasons why the wire may cause more or less resistance. The length, temperature, thickness and the material the wire is made out of are all factors, which will effect resistance. I have decided to test how the length of the wire effects resistance as it is the easiest experiment to perform. Temperature and thickness of wire would be far too hard to set up and changing the type of material used each time for the wire would yield small results as we could only use maybe 5 or 6 different metals. In my experiment I will only be recording the resistance from the different lengths. However the materials, temperature and thickness will still be very important, as they will still effect the resistance. I will try and keep the same wire each time simply making it shorter so it is the same material each time. AS it is the same wire the thickness won't change either. ...read more.

Middle

From these results I can get an average. Then using the average I can work out the resistance. To get the resistance I divide the current by the voltage. The formula for this is: � I will then repeat the experiment and the above bullet points for the other lengths of wire. � The wire looses 5cm each time. Equipment needed: 1x Wire at 50cm Wire cutters Variable power supply Variable resistor Ammeter - for measuring current Voltmeter - for measuring voltage The circuit: 1 = Voltmeter 2 = Variable resistor 3 = Ammeter 4 = Wire, 50-5cm long 5 = Variable power supply set at o.6v Prediction: I think that the shorter the wire is the less resistance there will be. This is because the longer the wire the further the electrons have to travel to carry on around the circuit. So because the wire is shorter the electrons don't have to pass as many ions. So the longer the wire is the more ions the electrons have to pass therefore the more ions the slower the electrons will be. Then this will be causing more resistance. Results: Length of wire (cm) Voltage (v) Current (amps) Resistance (ohms) Average resistance (ohms) Try 1 0.2 0.15 1.3 50 cm Try 2 0.3 0.3 1.0 1.1 Try 3 1.0 1.0 1.0 Try 1 0.2 0.2 1.0 45 ...read more.

Conclusion

So in conclusion, I made my prediction at the beginning and it was correct. The shorter the wire the less resistance. This is proven in my results. Evaluation: I think that the experiment went to plan quite well. Most of my results were correct except 2 lengths. I followed my plan of action and my step by step method very closely in an attempt not to make any mistakes. I managed to use the same ammeter and voltmeter each time so my results should not have varied much between the two lessons they were recorded in. The only problem that I encountered is that the wire from the first lesson got snapped causing us to have to get a new wire. The new piece of wire was actually of different thickness to the first wire. You can see this when you look at the result table. The 50cm and 45cm points are completely separate from the other results. If I was to try the experiment again I would try and be more accurate in my reading if the voltmeter and ammeter as I probably miss-read the results slightly each time. I would also get a voltmeter and ammeter that was more accurate. I would also make sure that I used the same wire each time as this messed up my results for the 50 and 45cm length of wire. ...read more.

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