• 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

# Investigate how the length of a wire affects resistance.

Extracts from this document...

Introduction

Contents

Page

1. Planning                                                      1
• Aim
• Hypothesis
• Apparatus
• Method
• Factors Affecting the Results
1. Observation                                                 4
1. Analysis                                                       5
• Graph showing change of resistance for each

set of result.

• Graph showing average change of resistance.
• Conclusion
1. Evaluation                                                   8

Planning

Aim: Investigate how the length of a wire affects resistance.

Hypothesis

My prediction is when the length of a wire increases its resistance increases as well. This prediction is a result of a simple theory. We know that everything is made of atoms. Atoms are made up of neutrons (neutral), protons (positive) and electrons (negative). Atoms have positively charged nucleus which contain the neutrons and the protons. They are surrounded by negatively charged, electrons. In metals the electrons are weakly attracted to the nucleus so they escape and are free to roam between atoms. When the metal is connected with any source of power, these electrons slowly flow in one direction. This slow flow is called the current. As the electrons flow through the metal they collide with the atoms and transfer energy to them. The electrons experience resistance to their forced movement between the atoms.

Middle

We have to measure the voltage for each set of results using a voltmeter.

Observation

 Length(in cm) Voltage1(in volts) Current1(in amps) Resistance1(in ohms) Voltage2(in volts) Current2(in amps) Resistance2(in ohms) Voltage3(in volts) Current  3(in amps) Resistance3

Conclusion

Most of my results were reliable. Look back at the page Observation’. The results marked in green are very reliable except for the one result marked in blue which is not very reliable. I think it one of the anomalous and caused mostly due to overheating of the wire. The only thing to be done is to remember to switch off the PSU after taking result. Also repeat readings for unreliable results to see improvements can be made. I think the rest of the results are accurate or reasonably 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
• Over 160,000 pieces
of student written work
• Annotated by
experienced teachers
• Ideas and feedback to