• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

How does the resistance of Nichrome wire change as its length changes?

Extracts from this document...

Introduction

image00.png

Aim: How does the resistance of Nichrome wire change as its length changes?

Plan: image11.pngimage09.pngimage10.pngimage07.pngimage08.pngimage02.pngimage05.pngimage06.pngimage03.pngimage04.pngimage01.png

First we connected the equipment as shown in the diagram above. The equipment that we will be using is as follows:

Lengths of Nichrome wire: To pass the current through.

Power Pack: To send the voltage through the Nichrome wire.

Crocodile clips: To hold onto the Nichrome wire during the experiment.

Voltmeter: To measure the voltage.

Ammeter: To measure the current.

Connecting wires: To connect the wire.

Ice Pack: To keep the Nichrome wire cool during the experiment.

Stop clock: To measure the time period.

I have chosen to use Nichrome wire because from my preliminary results I found that this wire had the highest resistance, as copper burned up on the lowest voltage possible on the power pack and also in my preliminary test I found that the Nichrome wire would burn up you placed it up higher than 4 volts. This was the reason why we placed an ice pack on the wire to keep it at a low temperature; another reason is that we know that if the temperature is too high then the resistance also becomes higher.

...read more.

Middle

Results

After collecting the two sets of results I placed them into tables.

The tables are shown on the opposite page.

The first table is only of the results received from the experiment, while the second table is of the same first table except with the resistance added to it.

Length of wire (in cm)

Voltage

Current

10

0.9

1.75

20

1.04

1.16

30

1.13

0.78

40

1.17

0.64

50

1.21

0.53

60

1.24

0.45

Resistance table:

Length of wire (in cm)

Voltage

Current

Resistance

10

0.9

1.75

0.5142857

20

1.04

1.16

0.8965517

30

1.13

0.78

1.4487179

40

1.17

0.64

1.828125

50

1.21

0.53

2.2830189

60

1.24

0.45

2.7555556

Resistance Graph:

image12.png

These tables

...read more.

Conclusion


As well as making these modifications I would also improve my Investigation by testing the same wire but different widths of that wire. I would do this to expand on my Investigation.

From the graph on the previous page I can see that the resistance of the wire is proportional to the length of the wire. I know this because the Line of Best Fit is a straight line showing that if the length of the wire is increased then the resistance of the wire will also increase.

Conclusion

In my prediction I said that:
If the length increases than the resistance will also increase in proportion to the length.
From my graph I have shown that my prediction was correct, as the Line of Best Fit is a straight line proving that the resistance of the wire is proportional to the length of the wire.
The length of the wire affects the resistance of the wire because the number of atoms in the wire increases or decreases as the length of the wire increases or decreases in proportion.

By Scharlie Tamar Anthea Robinson

Candidate Number: 8122

14343

...read more.

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

See related essaysSee related essays

Related GCSE Electricity and Magnetism essays

  1. Investigate how the resistance of a wire changes.

    if we use a thick wire and a thin wire for the voltage then we would get different results. It would not be directly proportional (length and resistance). * Cut the wire carefully, get the exact length. (cannot be even 1mm longer)

  2. Investigating how the resistance of Nichrome wire depends on its length

    I can say quantitatively, that if voltage doubles, resistance will also double. So I expect to see the results being directly proportional between length and resistance. I can explain this by using the collision theory. When a power supply is connected in a circuit an electric field is set up in the wires.

  1. How does length and width affect resistance

    � Find out what kind of figures the resistance are for different lengths. � Write the results of the preliminary work in a table below. � Find the appropriate apparatus and use them. � Investigate ways of making the experiment fairer and more reliable.

  2. Does Increasing the Length of a Nichrome Wire affect its Resistance

    As the length increases, the value for gradient will increase. The gradient = the resistance of the wire. Diagram Meterstick with Copper wire Equipment I am going to use the following equipment for my Investigation: > A piece of Copper Wire > A Ruler Stick > Power Pack > Variable

  1. Resistance of Nichrome Wire

    Movement of Electrons in a piece of Wire: Plan: To get my results I will use a Voltmeter and an Ammeter, and then record them in a table before using the formula to work out the resistance (formula shown below)

  2. Investigating How The Resistance Of A Wire Changes With Length

    The longer the wire, the greater the resistance. > Cross-sectional area - If the metal conductor has a large cross sectional area then the resistance is likely to be lower because there is more room for electrons to pass through the wire at the same time, therefore allowing more charge to pass through.

  1. Investigate how the electrical resistance of a wire changes in relationship to it's length.

    Another example of this is the wire was never totally straight when we started the experiment, which may also, as said earlier on, effect the resistance of it. I do not think that doing any more results in our experiment would have made it any more accurate.

  2. The aim of this investigation is how the resistance of a nichrome wire changes ...

    Therefore the resistance will increase. My Plan In order to make my investigation fair the voltage needs to be kept the same. I changed the length of wire. 10 different lengths of wire will be used. Length of wire will be measured in cm.

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