• 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

# An investigation in to the uses of Nichrome Wire

Extracts from this document...

Introduction

## Contents

CONTENTS

PLANNING

Introduction

Prediction

PRELIMINARY EXPERIMENT

Fair Test

EQUIPMENT LIST

METHOD

Results Table

OBTAINING EVIDENCE

Safety

Results Data Number 1

Results Data number 2

ANALYSIS

CONCLUSION

## Planning

Aim: The aim of this investigation is to find out whether the length of a wire affects resistance.

## Introduction

The purpose of this investigation is to focus on one of the four factors which affect the resistance of a wire; which in this case, ‘the length of a wire, affects the resistance in an electrical circuit’, the conclusive objective will be if the subject is proven in the experiment.

Explaining in brief, I am going to measure the resistance by using a thin, but long piece of Nichrome wire. I will keep increasing the wire length form 10cm to 100cm; this will enable me to come to a conclusion of the key question:

‘How does the length of a wire, affect the resistance in an electrical circuit?

### Prediction

My prediction of this investigation is that resistance is proportional to length. For example the resistance of a wire of 70cm should be higher than a resistance of a wire at 10cm, In fact 7 times more resistant. Resistance will increase with length. Resistance is in fact proportional to length.

The longer the wire, the higher its resistance, less current flows because the electrons have to get through more atoms in the way.

Increase in wire length = Increase in resistance

‘R µ L’

(Resistance is proportional to Length)

Scientific knowledge states that, ‘increasing the length if a wire, affects the resistance’. This is one of the four factors, which do.

Middle

## Method

• Set-up the required circuit as shown above.
• Use a metre ruler, to measure 40cm of wire, and attach ‘crocodile clips’, to the required measurement on the Nichrome wire.
• Turn on Power supply.
• Wait one minute to achieve confident readings.
• Take readings of Ammeter and Voltmeter, and place in a results table.
• Workout the Resistance. (Resistance (Ω) = Voltage

Current)

• Turn off Power Supply, and repeat with:

50cm, 60cm, 70cm, 80cm, 90cm and 100cm.

• (Repeat Method 1 more time, to ensure the experiment was a fair test and that the results obtained are reliable).

## Results Table

Create a results table much like the one below and record the results, into it.

Length of Wire (cms)

Current (Amps)

Voltage (Volts)

Resistance

(Ω)

40

50

60

70

80

90

100

## Safety

Doing this experiment I had to only take a few safety precautions, to ensure the safety of me and fellow members of my class; whilst the experiment was performed.

• I made sure that I turned the power supply off each time I was not using the equipment, this will avoid any electrical shocking or burns, if temperature is too high. This also leads to an unfair experiment, because increase in temperature is one of the four criteria’s, which affect resistance.
• I Kept the Voltage passing at 4V; this is because it will overload the current, causing a precipitant of smoke to come out. This leads to increase in temperature again, meaning an unfair effect on the resistance and invalid results.
• Gloves were worn when I carried out the experiment. This is vital especially when dismantling the experiment. The Nichrome wire, which may have experienced high temperatures, may still be very hot.
• Taking Care of what you do is important when carrying out this experiment. It will hinder the risk of accidents within the experiment.

Conclusion

Also, my first results do not seem to have any invalid data, due to the steady increase on my graph.

The second results may have invalid data, as it has an unsteady increase, at the points of 20 to 40cms.

Perhaps I retained odd results by invalid results from the apparatus, i.e. ammeter and voltage. I also, may have recorded the results incorrectly, due to poor measuring on the nichrome wire.

To improve my results, perhaps I should have completed the results at least 3 times, in order to get a broader conclusion of my results. In addition, as a student I only had basic equipment to carry out this experiment; Using advanced equipment, I would be able to calculate results correctly, rather than estimating with dubious equipment.

The data I have provided is sufficient, I believe. This is due to the guidelines I have provided in making sure, you achieve, accurate and valid results. In order to do this experiment correctly, you must do it at least more than one time, with caution on the last attempt.

In addition, my results confirm my prediction correct. My prediction of this investigation was that resistance is proportional to length. For example the resistance of a wire of 70cm should be higher than a resistance of a wire at 10cm, In fact 7 times more resistant. Resistance will increase with length. Resistance is in fact proportional to length. This statistically, meant that the results plotted on a graph; will have a strong positive correlation.

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. ## Resistance Aim: my main aim is to investigate the factors that affect the resistance ...

3 star(s)

Average Current (mA) Current (decreasing in voltage) Current (increasing voltage) Voltage (V) Sly. No 15.90 25.15 25.10 25.20 0.40 1 15.85 31.55 31.50 31.60 0.50 2 15.98 37.55 37.30 37.80 0.60 3 16.00 43.75 43.60 43.90 0.70 4 15.90 50.30 50.30 50.30 0.80 5 15.92 56.55 56.50 56.60 0.90 6

2. ## An experiment to find the resistivity of nichrome

use in my main experiment: POWER SUPPLY 2 VOLTS AMMETER VOLTMETER CROCODILE CLIPS WIRE METER RULER In my main experiment instead of using an ohmmeter I have chosen to use an ammeter and voltmeter , I have done this so that instead of relying on the ohmmeter to give the

1. ## Resistance of a Wire Investigation

Introduction Photosynthesis occurs only in the presence of light, and takes place in the chloroplasts of green plant cells. Photosynthesis can be defined as the production of simple sugars from carbon dioxide and water causing the release of sugar and oxygen.

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

The resistance also increases because it will take the electrons longer to pass from one end of the wire to the other end because the current is slowed down. The longer the wire, the longer the electrons have to stay squashed together so they are more likely collide into each

1. ## Investigation on the Resistance of Nichrome wire

To make sure the heating effect does not affect the wire I will make sure I complete my three experiments within 15minutes on the same day. The three experiments only take 15 minutes each time to complete and if they are done at the same time they would give

2. ## Design Brief

As it is a diode it will only let current pass through it in one direction. Motors: Electric Motors and Generators, group of devices used to convert mechanical energy into electrical energy, or electrical energy into mechanical energy, by electromagnetic means.

1. ## Resistance in a Wire Investigation

Apparatus: Constantan wire / 28-36 gauge / 0-100cm Multimeter Crocodile clips Connecting leads Ruler Wire cutters For this investigation, I will use a multimeter to measure the resistance of the wire. The wire I will use will be constantan. The gauges will be 28-36 going up in intervals of 2.

2. ## Resistance Investigation

Temperature: If the wire is heated up the atoms in the wire will start to vibrate because of their increase in energy. This causes more collisions between the electrons and the atoms as the atoms are moving into the path of the electrons.

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