• 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

# For my coursework I am going to investigate &quot;Ohms Law&quot;.

Extracts from this document...

Introduction

Ciarán McMullan 12c

### Introduction

For my coursework I am going to investigate “Ohms Law”. This states that the current flowing through a wire is proportional to the potential difference across it. I am going to test resistance through a wire from 0-80 centimetres at 10cm interval changing the voltage from 1.5 to 3 to 4.5 volts therefore repeating three times at each interval for reliability.

Safety

There are some rules and precautions to ensure safety while performing the experiment. We must:

• Tuck in our stools, tuck in our ties and stand during the experiment.
• Wear safety glasses.
• Not run.
• Listen carefully to all instructions.
• Take our time.
• Not touch the nichrone wire.

#### Hypothesis

I think that the amount of current flowing through the wire will be directly proportional to the length of the wire. As the length increases so will the resistance proportionally.

Apparatus

I will need the following things for this experiment:

A voltmeter, ammeter, battery power supply, key, stick with nichrone wire, metre stick and leads.

## Method

• Set up your apparatus according to diagram one after following the safety precautions.
• Place the key 10cm up the wire.
• Record readings onto table from ammeter and voltmeter. Resistance = V/I
• Do this 3 times, each with a different voltage – 1.5, 3 and 4.5volts.
• Repeat at 20, 30, 40, 50, 60, 70 and 80cm.
• Find the resistances and average resistance and record these in a table.

Middle

#### Results

Here is a table of my results.

 Length Of Wire Current Resistance Voltage Av. Resistance 1 2 3 1 2 3 1 2 3

Conclusion

2.95

3.83

2.713

50cm

0.41

0.82

1.38

3.51

3.69

3.2

1.44

3.02

4.42

3.5

60cm

0.35

0.68

1.07

4.22

4.16

4.1

1.48

2.83

4.39

4.16

70cm

0.3

0.63

0.96

4.76

4.68

4.64

1.43

2.95

4.46

4.693

80cm

0.28

0.53

0.86

5.32

5.29

5.42

1.49

3.02

4.5

5.343

Here is a graph of my results.

This graph shows a positive correlation between the two axis.

Conclusion

My conclusion is that the longer the wire is, then the higher the average resistance will be and we can see this in both the table and graph.

#### Conclusion

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. ## Ohm's Law coursework

4 star(s)

5. The power supply is then turned off and the second crocodile clip is moved to the next position. The above steps are completed for each length and then the entire investigation is repeated for accuracy. Preliminary: In order to decide upon the voltage and lengths of wire to use in

2. ## Resistance Of a Wire - Ohm's law.

The first crocodile clip is clipped to the wire at the 0cm position on the metre rule. 3. The second crocodile clip is clipped to the relevant position depending on the required length of wire. 4. The power supply is turned on.

1. ## Physics Coursework

Firstly, I feel it necessary why I have discounted one calibration curve. Firstly I have not ignored the results from run 1, they are perfectly reasonable and fair. The only reason to have a slight reservation about the first set of the results came about when inspecting the equipment after the first experiment.

2. ## Resistance Coursework

Throughout the experiment Constantan will be used. The type of material will affect the amount of free electrons that are able to flow through the wire. The number of free electrons depends on the amount of electrons in the outer shell of the atoms, so if there are more or larger atoms then there must be more electrons available.

1. ## Ohms Law.

Resistance is measured in ohms. A resistor has the resistance of one ohm if a voltage of one volt is requires to push the current of one amp through it. Resistance occurs when the electrons travelling along the wire collide with the atoms of the wire.

2. ## Ohm's law.

my results, if all the points are slightly too high the gradient will be dramatically altered. The way in which the readings are being taken is designed so that the readings are random but in an orderly way so that I can spot any mistakes.

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