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

Superconductivity. 907349

Extracts from this document...

Introduction

Ali jawad

Superconductivity

In this case study, I will talk about how resistance is linked with superconductivity. I will also talk about the benefits and risks about superconducting materials and how superconductivity can enhance our daily life.

Superconductivity occurs in certain materials (metals and ceramic materials) at very low temperatures. When a material is superconductive, it has an electrical resistance of exactly ZERO. Because these superconducting materials have no electrical resistance, this means that the electrons can travel through them freely so energy isn’t lost through heat and are long-lasting materials. The electrical resistivity of a metallic conductor decreases gradually as the temperature is lowered, as the lower temperature makes it easier for the electrons to pair up with little or no resistance.

...read more.

Middle

Zinc

Metal

0.88

Aluminium

Metal

1.19

Tin

Metal

3.72

Mercury

Metal

4.15

YBa2Cu3O7

Ceramic

90

TlBaCaCuO

Ceramic

125

http://www.howstuffworks.com/question610.htm

This table shows how the critical temperature varies between different superconductors.

Superconductivity was discovered in 1911 by Heike Kamerlingh Onnes. He was studying the resistance of solid mercury at cryogenic (very low) temperatures, when at 4.2K; he observed that the resistance disappeared.

...read more.

Conclusion

However, there’s no superconductors at room temperature, therefore we have to cool it a very low temperature for superconductivity to work. This is a MAJOR disadvantage, as it costs a lot of energy and money to get it to that temperature, making it less environmentally friendly as more fossil fuels are burnt adding to the effect of global warming/climate change.

For my practical, I’m measuring the resistivity of a metal and identifying it, linking it with this case study which is what it’s all about. So if the resistivity of that metal is zero; I know it’s a superconductor.  

Bibliography

1. Physics Review

April 2004, Volume 13, Issue 4

‘Supercool’

Elizabeth Swinbank

2. AS Salters Horners Advanced Physics

Heinemann

Page 99

3. http://en.wikipedia.org/wiki/Superconductivity

4. http://www.howstuffworks.com/question610.htm

...read more.

This student written piece of work is one of many that can be found in our AS and A Level Modern Physics 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 AS and A Level Modern Physics essays

  1. Peer reviewed

    Measurement of the resistivity of Nichrome

    5 star(s)

    that is drawn from the cell and pass through this part of wire. 3. I placed the iron slice on the wire so as to make sure that there is current flow in the circuit. 4. The iron slice was placed on the wire 5cm away from the end which nipped by the clip.

  2. Finding the Resistivity of a Wire

    There was very little discrepancy in my data. All the points on my graph lie almost exactly on the line of best fit. The only slightly anomalous result is that for the resistance at 0.1m, which lies 0.07? vertically away from the line. This was probably due to the higher potential for error associated with the lower readings for voltage and length.

  1. Physics - Resistivity

    The voltage across the bulb would depend on where the potentiometer splits, this can be described in the following equation: Where Vout is the voltage across the bulb, Vin is the voltage that's input into the circuit, Rb is the resistance on the first side of the potentiometer, and Ra is the resistance on the second side of the potentiometer.

  2. I am going to investigate what the resistivity is of a pencil lead. ...

    To minimise it I will keep windows and doors closed to minimise the drafts coming into the room and trying to keep the temperature constant. The reason the room temperature has to be kept constant is because the temperature of the wire will change in accordance with the room temperature.

  1. Investigating how temperature affects the resistance in a wire

    The only way I can estimate how accurate these results are is by looking at how much they deviate from the trend line and by comparing these results to the last one. As you can see from graph 5, the results do not deviate very much from the trend line

  2. Measuring The Resistivity Of A Pencil Lead.

    1.03V 0.1A 7.923? 1.03V 0.1A 7.923? 1.03V 0.1A 7.923? 1.03V 0.1A 7.923? 50mm 0.39V 0.1A 3? 0.39V 0.1A 3? 0.39V 0.1A 3? 0.39V 0.1A 3? 0.39V 0.1A 3? As you can see from my preliminary results my resistance did not fluctuate at a current of 0.1A at each extremity of the pencils length.

  1. Investigating the factors affecting the size of current flowing through a length of resistivity ...

    The formula can be rearranged so that A=?? x l /(V/ I). In this case, l, ? and V are all constants so A= I(?? x l)/V) and so A?? I. This shows that A?? I. Cross-sectional area is directly proportional to current. Doubling the cross-sectional area doubles the amount of current flowing through the putty.

  2. A superconductor is a substance which conducts an electric current with zero resistance. It ...

    They then won a Nobel prize in 1972. The BCS theory explained superconductivity at temperatures close to absolute zero for elements and alloys. However, this theory didn't success in explaining how superconductivity occurs in higher temperatures. The BCS Theory: The molecular vibrations in the lattice slow down when the temperature goes down, bellow the critical temperature this lack

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