• 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
7. 7
7
8. 8
8
9. 9
9
10. 10
10

# Investigate the factors affecting the Resistance of a piece of wire.

Extracts from this document...

Introduction

GCSE Physics coursework

Investigate the factors affecting the Resistance of a piece of wire

In a metal such as a piece of wire the atoms are arranged in a regular pattern and are held in position by electrical forces. The positive charges in the atom are concentrated in the atom’s nucleus and are unable to move. The negative charges, the electrons are away from the nucleus and are continually moving. When a metal conductor is connected to a battery the negatively-charged electrons move towards the positive end. This flow of charge creates an electric circuit. Metals are good conductors of electricity because they contain many free electrons.

When a metal conducts electricity the current is carried by electrons. The battery forces the electrons through the conductor.  The battery gives electrical energy to each electron, and as the particle makes its way round the circuit it gives up this energy in resistors in the form of heat.

Resistance is anything that constricts the flow of electrons. Voltage opposes resistance because it is trying to push the current round the circuit. The higher the resistance the less current flows through the circuit.

The amount of resistance in an electric current determines the amount of current in the circuit for any given voltage.

Resistance is measured by using the following equation:

Middle

Therefore the range of current for each length of wire was inbetween these two values.

In helping to prepare my planning I have referred to the following sources:

• Co-ordinated Science Physics Textbook
• CGP, GCSE Double Science, Physics revision guide.

GCSE Physics coursework

Investigate the factors affecting resistance of a piece a wire

Observing

Apparatus

Method

Different lengths of wire will we taken and added to a circuit. The resistance will be calculated, by finding out the voltage and current. A voltmeter will be used to measure the voltage and an ammeter to measure the current. A variable resistor will introduced to alter the current, which will make the results more accurate. The results will then be recorded in a table and graph, and any patterns that emerge will be recorded.

Results

 Length of wire (cm) Voltage (V) Current (A) Resistance (Ω) Average Resistance (Ω) 100 0.5 0.05 10 100 1.55 0.15 10.33 100 1 0.1 10 10.27 100 2.13 0.2 10.63 100 2.6 0.25 10.4
 Length of wire (cm) Voltage (V) Current (A) Resistance (Ω) Average Resistance (Ω) 200 1.19 0.06 19.8 200 2 0.1 20 200 2.3 0.12 19.12 19.11 200 2.5 0.14 17.86 200 3 0.16 18.75

Conclusion

This investigation has worked well, and has fitted my prediction.

The resistance of a wire depends on the number of collisions the electrons have with the atoms of the material. If there is a greater number of atoms there will be a larger number of collisions, which will increase the resistance of the wire. If a length of a wire contains a certain number of atoms, when the length is increased the number of atoms will also increase.

I think my method was a good way of carrying out this investigation. This is because I had a sufficient power supply, and was able to make my results more accurate by using a variable resistor.

If this experiment was repeated I could make sure that the wires were measured accurately using a meter rule, and I could check it again to make sure they are the correct length.

If I were to extend this investigation I would investigate the resistance of wire at different lengths, and have values inbetween the range I have already investigated. I would also investigate other factors which affect resistance, such as thickness of wire, temperature, material etc. I could therefore draw a conclusion what materials have more resistance than others, and I could also find out the best conditions in which resistance can be minimised.

Hayley Morgan

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. ## The factors affecting the resistance of a metalic conductor.

4 star(s)

If you consider this situation in terms of electrons, a wire with a small cross sectional area would have a smaller number of electrons flowing through it while a wire with a larger area would have a greater amount of electrons flowing through it thus allowing a higher current to flow through it.

2. ## Factors Affecting the Efficiency of a Wind Turbine

It is expected that if the temperature rise above 50�C the turbine's efficiency will be reduced so less current will be generated and the graph will start to curve. BLADE ANGLE Hypothesis The tip speed ratio is defined as the ratio of how many times the blades rotate greater than the windspeed.

1. ## To investigate the factors affecting current in a wire.

To keep the temperature constant, I will have to make sure that a large amount of heat doesn't build up in the wire (otherwise it will melt or affect the readings). In order to do this, the power pack will be switched off for a minute or so in between taking readings.

2. ## Physics GCSE Coursework:Factors affecting the resistance of a wire

so that the reading for the length will be more accurate, and also so there will be no bends in the wire to make it heat up and give an incorrect reading for the resistance. 2. Connect the circuit to the end of the ruler (at 100cm)

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

To speed up the pace of the experiment, an ohmmeter could be used to directly calculate the resistance. Out experiment was too slow and took a lot of time. Instead of reading the voltage and calculating the resistance, an ohmmeter could be used.

2. ## Investigate one or more factors affecting the resistance of metal wires

I measured the wire, which was 1m long, and decided to take readings every 10cm. I took the voltage reading every 10cm up to 1m, making sure that each time the current was constant at the particular length of wire (The current in the nichrome wire of diameter 0.28mm was 0.43A)

1. ## Discover the factors affecting resistance in a conductor.

Although this will change in different experiments, it will remain the same through each individual experiment. * The type of material The type of material has an effect on resistance, so must be kept constant. * The temperature This also has an effect on resistance.

2. ## Factors affecting Resistance of a wire

The material could not be tested, as there is not a wide range of materials or equipment to test this factor. The temperature of the equipment is not going to be tested because we did not have the equipment and it was more complex.

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