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

The Electrical Resistance of Wires

Extracts from this document...

Introduction

Karim Al-shammaa

The Electrical Resistance of Wires

Plan

Introduction

In this investigation I will be looking at the resistance of wires to an electrical current and determining the factors that affect the resistance of a wire.
There are five main factors that affect the resistance of a piece of wire. These are as follows:

1) The material that the wire is made of.
2) The length of the wire
3) The thickness (or diameter) of the wire.
4) The temperature of the wire.
5) Voltage of the circuit.

However, in my investigation I will only be looking at two different factors that affect the resistance of the wire. These two factors are length of the wire and thickness of the wire.

Apparatus

For this investigation I will need several pieces of apparatus, these are as follows:

1) A ruler (to measure the length of the piece of wire that is being used).
2) Wires (to connect the circuit together)
3) A multimeter (to measure the resistance of the wire)
4) A role of Constantine wire.


Method

In this investigation I will do as follows:
As I will be investigating one variable at a time, I will need to keep the other variables constant. When measuring the length I will always use the same material: Constantan wire. Also I will make sure that the wire does not get hot by not measuring any less than 10cm. Also, I will always use the same thickness wire, 32SWG (standard gauge).

...read more.

Middle




Results

Testing the thickness

Using a 50 cm long piece of Constantan wire:

SWG

Equivalent in mm

1st attempt

2nd attempt

3rd attempt

Average

20

24

26

28

30

32

34

38

0.9

0.56

0.45

0.37

0.31

0.28

0.25

0.125

1.4

1.5

1.9

2.7

3.7

4.5

6.5

14.2

1.5

1.5

2.0

2.7

3.6

4.3

6.5

14.4

1.4
1.4
1.9
2.9
3.7
4.5

6.7

14.2

1.4

1.5

1.9

2.8

3.7

4.4

6.5

14.3

Testing the Length

Using 32 SWG (0.28mm) thickness Constantan wire:

...read more.

Conclusion


I could have made more accurate results and a more varied set of results by doing the experiment at more than just 32SWG. This would have given more varied results at different thicknesses. I could have made my results more accurate by doing the experiment more than 3 times (perhaps 5 times) and taken the average of each set of results. This would have given me more accurate results.
Inaccuracy in the results (like in the first attempt on length at 40cm) may have been due to the fact that the equipment used may not have been working properly or plain human fault. Also, when measuring the length of wire to be tested, it is possible that I may have slightly misread the length on the ruler by a couple of millimeters because of kinks and twists in the wire making it nearly impossible to get a perfectly straight piece of wire. This may have caused slightly inaccurate results.

Thickness

My results for testing the thickness were, on the whole, quite accurate with the exception of minor mistakes. This could have been due to an inaccurate length of wire, a temperature change or an inaccurate reading. However, the over all results produced a good smooth inversely proportional curve. If I were to conduct this experiment again I would have used more accurate equipment and tested more lengths at more SWGs than I did to give a more varied set of results.





...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. Peer reviewed

    Investigation in resistance in wires

    5 star(s)

    The Voltage was measured across the Nichrome wire with a voltmeter we measured it in volts, rather than using the rough estimate of power from the power pack which doesn't take into account the resistance. The current was measured with an ammeter, which measured in amps.

  2. Investigate the resistance of different wires and how at different lengths the voltage increases ...

    semi-conductor because it has some copper, nickel and added impurities in it. Referring to my scientific knowledge, semi-conductors have a higher resistance than conductors. I think that copper will have the lowest resistance because it is a pure metal and it is an excellent conductor so the current will flow through it freely.

  1. Resistance and Wires

    These include: V�I = R which can be manipulated into V= I�R. The drawing (figure 1) shows the circuit diagram. In my prediction I stated my opinion that resistance should increase as the length of the wire increases. After conducting the test, I found that my prediction was indeed correct

  2. Resistance of wires

    So the proportion is inverted. (I finally got it right!) Temperature ~ As I learned from the "collision theory", if heat is applied to any matter, the particles vibrate and fire up energetically, and begin to move about more as the temperature increases.

  1. Resistance of Wires

    a reasonable quantity for reliability > I will use one cell in the circuit These decisions were made based on the fact that I was able to control current to keep it under 1A as is required, but also these specifications determined by the preliminary work and imposed on the

  2. Resistance of wires.

    The temperature of a wire is likely to rise when a current travels through the wire, as the resistance of the wire will result in some of the electrical energy being transformed into heat energy, so the temperature of the wire will increase.

  1. Investigating a factor affecting the electrical resistance of a wire.

    The other variable I will keep constant is the material that the wire is made of. We are only given constantan alloy as wire, so that will be the only variable it is impossible for me to change. However, changing the material could either increase or decrease the resistance of the wire as all the materials have varying resistances.

  2. Objective: to investigate how the rate of resistance is affected by the different thicknesses ...

    circuit with effortlessness and this will lead to an increase in the current whereas the decrease in the resistance. 3. Material of Wire A current flowing through a circuit smoothly will be down to how the material of the wire is.

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