Solution
The energy transformations of a coal fired power plant
Solar -------> Chemical potential
--------> heat --------> kinetic----> electrical
Photosynthesis is the process that traps
solar energy and converts it into chemical potential energy.
This energy is stored in plant matter and is released as heat energy
when coal is burnt. This heat is used to turn water into steam. The steam(water)
molecules have a great deal of kinetic energy(they move very fast). This
kinetic energy is used to turn the turbines that spin the generators producing
electrical energy..
The energy transformations of a hydro-electric power plant
Solar-----> gravitational potential----->kinetic---->electrical
Water in the oceans of the world absorb solar heat energy. This heat energy causes the evaporation of many billions of tons of water around the world. The resultant water vapour rises high into the atmosphere where it condenses back into water and falls as rain. This water is trapped in man-made dams and used to turn huge turbines that spin the generators to create electrical energy.
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Energy
transformations |
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Click here for a quick lesson on energy and its conversion from one form to another. We know that energy can not be created or destroyed but it can change from one form into another. We see examples of such transformations every day. Chemical potential energy and its transformations into other forms of energy are covered in a separate section and will not be covered in this chapter. Click to go to "Transformations of Chemical Potential Energy" When looking at the energy transformations below it is assumed that no energy is lost in the transformation. In reality this is not true as energy is lost at every step, mainly as heat.
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All energy
on Earth has originated from the Sun. We change the many forms of energy
into electrical energy to drive our modern cities and to maintain our
standard of living. There are many different types of power stations,
two of which are coal fired and hydro-electric power plants. Although
both coal-fired and hydro-electric power plants use generators to produce
electricity it is the method each uses to spin the turbines driving the
generators that is different. |
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It is said that the electrical
energy from coal-fired and hydro-electric power plants started as solar
energy. Explain. Use the following words in your explanation. Solution |
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Continue
with energy transformations calculations(gravitational into kinetic)
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