• 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
11. 11
11

# An Experiment To Find the Resistivity of a Wire

Extracts from this document...

Introduction

3

AN EXPERIMENT TO FIND THE RESISTIVITY OF A WIRE

In this experiment, I am going to find out the relationship between Resistivity, Resisistance, cross sectional area and length of the wire, which in this case is Constantan. So I can find the Resisitivity of Constantan.

RESISTIVITY of a wire is the property of the wire, measured in ohmmeter. It is a measure of how the material opposes the flow of current through it. The Resistivity of a wire along with its Resistance is temperature dependent.

To do this, I will find out the resistance of the wire at different length by measuring the potential difference over a range of 0.05v-0.80v and the current at that particular length of wire, to find the relationship between Resistance and length.

There are several factors that may affect the Resistance of a wire. Some of which are:

• The material of the wire
• The cross sectional area
• The length of the wire
• The temperature of the wire.

In doing this, I have to keep the material of the wire constant by using the same type of wire which in this case is Constantan, the cross sectional area of the wire will be kept constant

Middle

0.03

1.67

0.10

0.06

0.15

0.09

0.20

0.12

0.25

0.15

0.30

0.18

0.15

0.05

0.02

2.50

0.10

0.04

0.15

0.06

0.20

0.08

0.25

0.10

0.30

0.12

0.20

0.05

0.02

3.33

0.10

0.03

0.15

0.04

0.20

0.06

0.25

0.07

0.30

0.09

0.25

0.05

0.01

4.17

0.10

0.02

0.15

0.03

0.20

0.05

0.25

0.06

0.30

0.07

0.30

0.05

0.01

5.00

0.10

0.02

0.15

0.03

0.20

0.04

0.25

0.05

0.30

0.06

Table of results I got when I varied the Cross Sectional Area using a wire of length 0.10m

 Cross Sectional Area / Χ10-8

Conclusion

I feel that the only way to make my results more accurate would be to use a different method. I could even use a rheostat in place of a wire, because it is essentially a long coiled wire that is connected at different lengths to change the Resistance of the wire. If I were to do this experiment again, I will measure the diameter of the wire at 3 different positions on the wire and take the average of the 3 values. And I will use a Digital Voltmeter and Ammeter and take a wider range of readings like about 8 readings to ensure a greater accuracy in the obtained results and in the plotted graphs. I will then repeat this experiment twice for each potential difference and current readings in a particular length of wire.

The value for the Resistivity of constantan I found is 2.56 × 10-7 Ωm. This is different from the value of Resistivity in the Data book which is 4.70 Χ 10-7Ωm, with an error of  45%. This error may have been as a result of what I talked about in my evaluation. It may also have been as a result of the different method used in obtaining this result.

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. ## Nichrome Wire Experiment

Table of results Here are our results for the current at 0.25Amps. Length of wire (cm) Voltage (V) Resistance (Ohms) 20 0.25 1 25 0.31 1.24 30 0.38 1.52 35 0.44 1.76 40 0.50 2 45 0.55 2.2 50 0.54 2.36 55 0.67 2.68 60 0.77 3.08 Here are our results for the current at 0.50Amps.

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

experiment Main Method Before I start my main experiment I have chosen to do a risk assessment which is shown below. Risk Assessment: "h I will handle the power supply carefully. "h I am going to only use a voltage of 2 volts.

1. ## Investigating the resistivity of constantan

Accuracy In order to minimise errors and for a fair test, I will measure the diameter of the wire using a screw gauge at several different places and at different directions across the wire. I will then work out an average of these measurements.

2. ## Investigating the resistivity of an unkown wire

So the sum of all the "pds" across all the components in a series circuit is equal to the emf of the power supply. When the components in the circuit are connected in parallel, each has the same potential difference across it.

1. ## Measuring the Resistivity of a Wire

* Switch - so that the power is not constantly running through the circuit thus causing the wire to heat up. During this experiment I need to be aware of the safety element of it and therefore prevent any possible hazards before they can occur.

2. ## Determining the resistivity of a piece of wire

As can be seen the nuclei are represented as large orange/yellow 'dots'. The coulombs of charge are represented by the small red dots and the small orange/yellow dots are the fixed electrons. The nuclei resist the flow of coulombs and thus produce electrical resistance.

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