• 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

Nuclear Power

Extracts from this document...

Introduction

Nuclear Power Nuclear power plants create electricity using the energy released by splitting atoms to boil water and create steam which turns a steam turbine driving a generator. Since no fuel is burned, there are no gases or pollutants released into the air. The water used to create steam is isolated from radiation and any hot water to be discharged is cooled down in ponds or in tall cooling towers. Nuclear waste is the only byproduct of nuclear power and is packaged and stored rather than released into the environment. Unlike other fossil fuels, nuclear power plants release almost no emissions into the environment. Two different light-water reactor designs are currently in use, the Pressurised Water Reactor (PWR) and the Boiling Water Reactor (BWR). Diagram of a PWR In a PWR, the heat is removed from the reactor by water flowing in a closed pressurized loop. The heat is transferred to a second water loop through a heat exchanger. The second loop is kept at a lower pressure, allowing the water to boil and create steam, which is used to turn the turbine-generator and produce electricity. Afterward, the steam is condensed into water and returned to the heat exchanger. ...read more.

Middle

Many birds rely on the tide uncovering the mud flats so that they can feed. there are few suitable sites for tidal barrages. * Only provides power for around 10 hours each day, when the tide is actually moving in or out. Solar Power The photovoltaic solar cell is a semiconductor that converts light into electricity. As light strikes the surface of the cell it is absorbed and frees electrons in the top layer which are then trapped in the bottom layer. When the top and bottom layers are connected by an electric circuit, the electrons travel back to the top layer through the circuit creating an electric current.In this form of cell there are two layers of semiconductor material, one negative and the other positive. The layers are made mostly of silicon crystal with some impurities added (doping). In the top layer some of the silicon atoms (orange dots) have been replaced by an element that has one more electron such as phosphorous (green dots) which makes the layer negative (n-type layer) due to the extra electrons. In the bottom layer, some of the silicon atoms have been replaced by an element that has one less electron such as boron (red dots) ...read more.

Conclusion

Combined cycle plants use about 10 million gallons of water per day, consuming 7 million and putting 3 million gallons back into nearby rivers. Wave Energy There are several methods of getting energy from waves, but one of the most effective works like a swimming pool wave machine in reverse. At a wave power station, the waves arriving cause the water in the chamber to rise and fall, which means that air is forced in and out of the hole in the top of the chamber. We place a turbine in this hole, which is turned by the air rushing in and out. The turbine turns a generator. A problem with this design is that the rushing air can be very noisy, unless a silencer is fitted to the turbine. The noise is not a huge problem anyway, as the waves make quite a bit of noise themselves. Advantages * The energy is free - no fuel needed, no waste produced. * Not expensive to operate and maintain. * Can produce a great deal of energy. Disadvantages * Depends on the waves - sometimes you'll get loads of energy, sometimes nothing. * Needs a suitable site, where waves are consistently strong. * Some designs are noisy. * Must be able to withstand very rough weather. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Green Plants as Organisms 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 Green Plants as Organisms essays

  1. The Waste Land by Eliot emphasises the themes of dystopia and apocalypse.

    Death in this case is tied to religion; in many religions, gods are burned or drowned in effigy so that they may be reborn, in accord with religious myth. Therefore from a religious standpoint, these references to water are actually positive.In fact, this rebirth is referred to at the end

  2. Study the condensation of steam at different temperature levels

    My first idea would look like this. This idea was going to need serious reworking after running a few preliminary tests and putting some extra thought in due to the following reasons. * Although advantageous for the reasons already state, the slides were only going to collect a mass of

  1. Ashland Oil Inc.: Trouble at Floreffe

    Whether a permit had been filed to use the tanker The tanker had been transported from Cleveland, and many were under the impression that it was a new tank. Upon more investigation, it was found that while the tank had been newly constructed, it was made out of 40-year-old steel.

  2. Temperature regulation in mammals & birds.

    The type of thermometer used was the same on each occasion, but the actual one was different. * The movement of the thermometer / test tube proved also to be difficult to control. With 26 other people trying to conduct their experiments at the same time, movement of the bench would have inevitably occurred.

  1. Three Gorges Dam Essay.

    'Experts' say that with the dam built, the flow of water can be controlled to prevent frequent floods from once a decade to once a century as the reservoir has a storage capacity of 22.1 billion cubic meters.

  2. Generating electricity

    This spinning shaft is connected to the rotor of a generator, and the generator produces electricity. The diagram below shows this process Fossil-fuelled plants Fossil fuels are what are left of plant and animal life that existed millions of years ago.

  1. Teas Farming in India

    This process can take between 10-16 hours, depending on the wetness of the leaf. Some factories will gently hasten the process with the air of warm air fans. The withered leaf is broken by machine so that the natural juices, or enzymes, are released and on contact with air will oxidise.

  2. The history of the canals

    Now they are used for pleasure. Unlike rivers canals do not flow. They are built on the level; this stops the water running away. When the land becomes uneven and not on the level, the canal is built in sections, which are called pounds.

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