• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month
Page
1. 1
1
2. 2
2
3. 3
3
4. 4
4
5. 5
5
6. 6
6

# Investigation into the Resistance in different lengths of wire

Extracts from this document...

Introduction

## Investigation into the Resistance in different lengths of wire

Introduction

In this investigation, I will be looking at how the resistance in a piece of wire changes when I change the length of the wire. The variable in the experiment will be the length, and the thing I am studying will be the resistance.

Equipment

• For my experiment I will need:
• Wires of set length - for connecting the circuit together
• A Variable Power Pack - to give the experiment its power and so that I can adjust the current to a suitable level
• Wire that I can cut and adjust - this is the wire I will be testing though, so it must be bare.
• Crocodile clips, to secure the wire
• Voltmeter - to measure the voltage
• Ammeter - to measure the current

Diagram

A

V

Method

I will set up the experiment as shown above, and then connect the 100cm wire to the crocodile clips, and turn the power on. Then I will take a reading of the Ammeter and Voltmeter, and record them. Then I will remove this wire, and replace it with a 90cm long wire, take a reading, and remove it. I will do the same for the 80cm, 70cm and so on, until I have reached 0cm. I have decided to use wire at 10cm intervals because it gives a nice even spread over the 100cm range, and it is small enough for me to see where anomalies are. So this means that if anything goes wrong, I can easily see it.

Middle

∝ L, where R is the resistance, and L is the length of wire. If my prediction is correct, I should see a straight line on my graph.

Results

Here are the results for my experiment...

the first time:

 Length of wire (cm) Voltage(V) Current(A) Resistance(Ω) 100 1.66 0.08 20.75 90 1.66 0.09 18.44 80 1.66 0.10 16.60 70 1.66 0.11 15.09 60 1.62 0.13 12.96 50 1.60 0.16 10.00 40 1.57 0.19 8.26 30 1.55 0.25 6.20 20 1.50 0.38 3.95 10 1.39 0.70 1.99

the second time:

 Length of wire (cm) Voltage(V) Current(A) Resistance(Ω) 100 1.66 0.08 20.75 90 1.66 0.09 18.44 80 1.66 0.10 16.60 70 1.64 0.11 14.91 60 1.62 0.13 12.96 50 1.60 0.17 9.41 40 1.58 0.20 7.90 30 1.55 0.26 5.96 20 1.50 0.38 3.95 10 1.39 0.70 1.99

Conclusion

R ∝ L

∴ R = k L

∴ k = R/L

subst. When L = 10, R = 1.98

∴ k =  1.98/10

∴ k  = 0.198

∴ R = 0.198 x L

I have found that the formula for the resistance in this piece of wire was approximately 0.198 x the length of the piece of wire. I can now determine the resistance for any length of this type and quality of wire.

Evaluation

I think that the method we used and the results we obtained were both suitable and acceptable for the experiment, because they both fitted quite neatly with the experiment itself. The results were in the range I expected, and the method was not over-complicated, but it was still fairly practical. Looking at my title and introduction, I have done what I set out to do.

I think that the least accurate part of the investigation was probably me, because my measuring probably could have been a lot more accurate if I had taken more time and care over it, but I am happy with the results and method I got.

There were no highly anomalous results, and those that were slightly out of sink, I have explained in my ‘anomalies’ section. If I were to do this investigation again, I think I would probably not change much, but just try and be a little more accurate.

This student written piece of work is one of many that can be found in our GCSE Electricity and Magnetism section.

## Found what you're looking for?

• Start learning 29% faster today
• 150,000+ documents available
• Just £6.99 a month

Not the one? Search for your essay title...
• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month

# Related GCSE Electricity and Magnetism essays

1. ## Investigate the resistance of different wires and how at different lengths the voltage increases ...

as each material has a different atomic structure the resistance will vary. Atomic structure of copper:- Electrons per energy level: 2, 8, 18, 1 Shell model If the atoms in the wire are closely packed, then this will cause an increase in resistance, due to frequent collisions.

2. ## Resistance of a Wire Investigation

Method Equipment needed: * 1 x Power Pack (to give varied voltage) * 1 x Voltmeter * 1 x Ammeter * 5 x wires (with crocodile clips) * Wire of varied length and thickness * Controlled variables: * Temperature (room temperature)

1. ## An in Investigation into the Resistance of a Wire.

When there was a current running through the circuit and there were exposed wires for example the clips I did not touch them because this could be very dangerous because there is electricity going through them. I also did not touch the experiment wire because it could be hot due

2. ## Resistance Investigation. My aim in this investigation is to measure the amount of resistance ...

energy which will decrease the flow of the current and will increase the resistance of the current because more collisions will occur. What variables can I investigate? One of the many variables that I can investigate is the length of the wire.

1. ## Investigate how the resistance changes in a wire of different lengths.

In a smaller length of wire, there are fewer collisions between the fewer number of stationary particles and electrons so the wire is cooler, as shown by the path of the electron. A piece of wire double of that at the start, means double the number of stationary particles.

2. ## An Investigation into Finding the Different Values of Resistance with Different Lengths of Wire.

Use diagrams if you wish. Safety In this experiment there are few but important safety issues to consider and are the following: * Not to touch the wire as when current flows through the wire, the wire may become hot. * Not to touch the electricity.

1. ## Resistance in a Wire Investigation

following factors would make a difference in the resistance of a wire : ( I have made a prediction for each factor from my own scientific knowledge on how I think the resistance would change in a wire for that particular factor )

2. ## Resistance Investigation

of voltage; capacitance makes the peak value of voltage lag behind the peak value of the current. Capacitance and inductance inhibit the flow of alternating current and must be taken into account in calculating current flow. The current in AC circuits can be determined graphically by means of vectors or

• Over 160,000 pieces
of student written work
• Annotated by
experienced teachers
• Ideas and feedback to