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प्रश्न
Distinguish between the following.
Electricity generation from solar cells and solar thermal power generation
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उत्तर
| Electricity generation from solar cells | Solar thermal power generation | |
| i. | Solar radiation energy is converted directly into electrical energy. | The energy in solar radiation is first converted into thermal energy and then converted to electrical energy through various stages. |
| ii. | The electrical energy is generated directly by the photovoltaic effect. | The electrical energy is generated using reflectors, condenser, cooling tower, turbine and generator. |
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संबंधित प्रश्न
Name some of the solar energy devices.
What is the range of temperature which can be achieved in a box-type solar cooker in two to three hours?
How much solar energy will be received by 1 m2 area in one hour if the solar constant be 1.4 kW/m2?
Explain why, a plane mirror reflector is used in a box-type solar cooker.
If the energy received by 5 m2 area in 10 minutes is 4200 kJ, calculate the value of solar constant.
With the help of a labelled diagram, explain the construction and working of a solar cooker.
Why is the solar cooker box covered with a glass sheet?
The radiations present in sunlight which make a solar cooker work are:
(a) visible light rays
(b) ultraviolet rays
(c) comic rays
(d) infrared rays
What steps would you suggest to reduce energy consumption?
Draw a neat and labelled diagram.
One solar panel produces a potential difference of 18 V and current of 3 A. Describe how you can obtain a potential difference of 72 Volts and current of 9 A with a solar array using solar panels. You can use sign of a battery for a solar panel.
Write a short note on electrical energy generation and environment.
Re-write the statement by selecting the appropriate option.
The solar lamp uses the ................... energy.
Which of the following solar radiations pass through the atmosphere of Earth: X -rays, ultraviolet rays, visible light rays or infrared radiation?
Make a table based on forms of energy and corresponding devices:
| Forms of Energy | Devices | |
| a. | Electric | _________ |
| b. | Mechanical | Sewing machine, Bicycle |
| c. | Thermal | __________ |
| d. | _________ | Solar cooker, Solar heater |
The potential difference available from a solar cell depends on its area.
Solar reflectors are important, why?
Give scientific reason.
Hydropower, solar energy and wind energy are called renewable energy.
Complete the following flow chart.
Complete the table.
| Limitations of Solar energy | Limitations of Wind energy |
Which one of the following forms of energy leads to least environmental pollution in the process of its harnessing and utilisation?
