Give Scientific Reasons:
The construction of turbine is different for different types of power plants.
  1. Turbines are used to rotate the generator at a power plant.
  2. Energy source used to rotate the turbine is different at different power stations.
  3. Steam of very high temperature and pressure is used in thermal, atomic and solar thermal power plant.
  4. In a power plant based on natural gas, the turbine is run by a gas at very high temperature and pressure generated by combustion of natural gas.
  5. The kinetic energy of the flowing water drives the turbine at a hydroelectric power station.
  6. The kinetic energy of wind drives the wind turbine.
  7. There is a difference in the temperature and pressure of the fluids used to rotate the turbine and so the construction of turbine is also different.
2 Marks
It is absolutely necessary to control the fission reaction in nuclear power plants.
  1. Fission of Uranium 235 is a chain reaction.
  2. Three neutrons are released at every stage and the reaction may proceed at a triple rate.
  3. In every fission reaction 200MeV energy is relesed.
  4. If it is not controlled, it may cause an explosion.
  5. Hence, it is absolutely necessary to control the fission reaction in nuclear power plants.
2 Marks
Hydroelectric energy, solar energy and wind energy are called renewable energies.
  1. The water in a reservoir used for hydroelectricity generation can be replenished during rainy season.
  2. Sun is practically a never ending source of energy.
  3. Wind will also be generated perpetually.
  4. Hence, hydroelectric energy, solar energy and wind energy are called renewable energies.
2 Marks
It is possible to produce energy from mW to MW using solar photovoltaic cells.
  1. Many solar panels are connected in series and in parallel to generate required current and potential difference.
  2. Many solar panels connected in series form a solar string, and, many solar strings connected in parallel form a solar array.
  3. We can thus obtain as much electrical power as needed.
  4. Hence, it is possible to produce energy from mW to MW using solar photovoltaic cells.
2 Marks
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This page was last modified on
30 July 2019 at 03:18

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