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प्रश्न
Give scientific reason.
Hydropower, solar energy and wind energy are called renewable energy.
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उत्तर
- The sources of energy which are being produced continuously in nature and are inexhaustible, i.e., they are always available for use are called renewable sources of energy.
- Hydropower, solar energy, wind energy are produced from energy sources like water, sunlight and wind respectively that are produced continuously in nature and will not get depleted.
Thus, hydropower, solar energy and wind energy are called renewable energy.
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संबंधित प्रश्न
What kind of mirror – concave, convex or plain – would be best suited for use in a solar cooker? Why?
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What is a solar cell panel? For what purpose is it used? State its two main advantages.
With the help of a labelled diagram, explain the construction and working of a solar cooker.
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(a) 1.4 kWh
(b) 1.4 kW/m
(c) 1.4 kW/m2
(d) 1.4 kW/m3
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(a) 5040 J
(b) 504.0 kJ
(c) 5040 kJ
(d) 5.04 kJ
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ii. Give one advantage and one disadvantage of this energy.
Draw a neat and labelled diagram.
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| Forms of Energy | Devices | |
| a. | Electric | _________ |
| b. | Mechanical | Sewing machine, Bicycle |
| c. | Thermal | __________ |
| d. | _________ | Solar cooker, Solar heater |
Solar photovoltaic cells convert the solar radiation energy directly into ______ energy.
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