• 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

# The experiment I have chosen to carry out will record whether the length of a wire will affect the resistance in a complete circuit. I will set up an experiment, setting up a complete circuit

Extracts from this document...

Introduction

Physics Coursework

Investigating factors affecting resistance

The experiment I have chosen to carry out will record whether the length of a wire will affect the resistance in a complete circuit.

I will set up an experiment, setting up a complete circuit with a wire of length 1metre. I will then record the current and voltage at certain lengths of wire. From these two measurements, I can calculate the resistance using ohms law. I will take measurements every 5 cm of wire until I reach 30 cm, when I will measure every 10 cm instead.

The experiment will be carried out twice and the average of the two resistances (at each measurement) will be used.

I will need to use:

. 1 power cell – to create a source of power for the circuit

. 1 metre of wire – to measure the resistance from (diameter 28 SWG)

. Volt metre – To measure the voltage

.

Middle

Results:

Experiment 1:

 Length of Wire (cm) Current (Amps) Voltage (volts) Resistance (Ω) 5 0.93 0.53 0.569892473 10 0.61 0.72 1.180327869 15 0.48 0.84 1.75 20 0.41 0.92 2.243902439 25 0.36 0.98 2.722222222 30 0.32 1.02 3.1875 40 0.26 1.1 4.230769231 50 0.22 1.17 5.318181818 60 0.19 1.22 6.421052632 70 0.17 1.28 7.529411765 80 0.15 1.31 8.733333333 90 0.14 1.33 9.5 100 0.13 1.35 10.38461538
 Length of Wire (cm)

Conclusion

The resistance increased because, as was mentioned in the prediction, resistance is a measure of how difficult it is to push electrons through a wire, so the larger the resistance, the more force you have to apply and the more energy you use to produce a current. This is why the voltage went up whilst the current went down.

The resistance of a wire is: R = r × L÷A.

L is the length of the wire, A is the cross-sectional area of the wire, (Of course, to get the most accurate results possible when applying this equation, we should make sure that the cross-sectional area of the full length of the wire is known.) and r is the “resistivity” of the material. Long, thin wires have the most resistance, just like long, thin pipes.

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. ## Design an experiment to predict and test the output from a simple AC generator.

5 3.42 188.10 9 1.20E-04 0.17 As can be seen the combination of wires 7, 8 and 9 and bulb 4 and wires 6, 7, 8 and 9 and bulb 5 work. However when we take into consideration that the length of the wires in some cases is a great

2. ## Physical - Circuit

the highest amount of resistance compare to the diameter of 0.45mm wires, this is because that it can allow the greatest flow of charge to pass through. The materials of the wires could be affecting the experiment, as we used the wires of copper, the results should be better than

1. ## Carbon track experiment

I think that the graph would look like this. Fair testing To make this experiment a fair test I will only have independent variable and one dependent variable for each series of results. I will test how the length and width affect the resistance, but only one at a team.

2. ## Which factors affect resistance in a circuit?

Other factors, which we need to consider when finding the resistance of a material, length of wire, thickness of wire, and temperature of environment around circuit. Experiment plan: In this experiment we will measure the resistance in a circuit, with varying lengths of wire and compare how the length of wire affects the resistance.

1. ## Find out (through an experiment) how much resistance a piece of copper wire will ...

These collisions convert some of the energy that the free electrons are carrying into heat. How is it measured? The resistance of a length of wire is calculated by measuring the current present in the circuit (in series) and the voltage across the wire (in parallel).

2. ## Find out whether the length of a wire will affect the resistance.

In this investigation a simple circuit will be set up to read the voltage and current when the length of the wire changes. The length will range from 10cm - 100cm (1m) with intervals of 10cm. Moving the crocodile clip across the wire on a ruler will change the length of the wire.

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