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Satkriti Roao
@satkriti-roao
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Joined: Jun 14, 2021
Last seen: Aug 6, 2021
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Topics: 2248 / Replies: 1
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Topic
Name one source of energy which is not derived from solar energy directly or indirectly.
3 years ago
Forum
Sources of Energy
Replies: 0
Views: 292
Topic
What substance is obtained as a residue when wood is burned in a limited supply of air?
3 years ago
Forum
Sources of Energy
Replies: 0
Views: 285
Topic
Solar cells are used to provide the electric current to charge the batteries of a car driven by an electric motor. Describe the energy changes which take place. (b) What differences would you expect in the charging of car batteries
3 years ago
Forum
Sources of Energy
Replies: 0
Views: 129
Topic
In many applications, solar cells are connected to rechargeable batteries. Why is this so?
3 years ago
Forum
Sources of Energy
Replies: 0
Views: 121
Topic
In a solar water heater, why is the storage tank placed at a higher level than the solar panel containing coils?
3 years ago
Forum
Sources of Energy
Replies: 0
Views: 420
Topic
A large coal-fired power station produces 2000 MW of electrical energy. A wind turbine with 33 m blades can produce 300 kW. (a) How many turbines would be needed to replace the power station?
3 years ago
Forum
Sources of Energy
Replies: 0
Views: 347
Topic
(a) State two advantages of using wind energy for generating electricity. (b) Mention two limitations of wind energy for generating electricity.
3 years ago
Forum
Sources of Energy
Replies: 0
Views: 423
Topic
What is wind? What type of energy is possessed by wind? (b) Explain how, wind energy can be used to generate electricity. Illustrate your answer with the help of a labelled diagram.
3 years ago
Forum
Sources of Energy
Replies: 0
Views: 434
Topic
(a) With the help of a labelled diagram, explain the construction and working of a solar cooker. (b) Why is the solar cooker box painted black from inside? (c) Why is the solar cooker box covered with a glass sheet?
3 years ago
Forum
Sources of Energy
Replies: 0
Views: 341
Topic
(a) State two advantages of producing hydroelectricity. (b) State two disadvantages of producing hydroelectricity.
3 years ago
Forum
Sources of Energy
Replies: 0
Views: 291
Topic
What is hydroelectricity? Explain the basic principle of generation of hydroelectricity with the help of a labelled diagram.
3 years ago
Forum
Sources of Energy
Replies: 0
Views: 352
Topic
How has the traditional use of wind energy been modified for our convenience?
3 years ago
Forum
Sources of Energy
Replies: 0
Views: 363
Topic
How has the traditional use of energy of flowing water been modified for our convenience?
3 years ago
Forum
Sources of Energy
Replies: 0
Views: 291
Topic
(a) What is solar constant? What is the value of solar constant? (b) If the energy received by 5 m^2 area in 10 minutes is 4200 kj, calculate the value of solar constant.
3 years ago
Forum
Sources of Energy
Replies: 0
Views: 231
Topic
What is a solar cell panel? For what purpose is it used? State its two main advantages.
3 years ago
Forum
Sources of Energy
Replies: 0
Views: 110
Topic
State the advantages and disadvantages of using solar cells.
3 years ago
Forum
Sources of Energy
Replies: 0
Views: 66
Topic
(a) What is a solar cell? Draw the labelled diagram of a solar cell. (b) Name the semi-conductor material which is usually used for making solar cells. (c) Write the uses of solar cells.
3 years ago
Forum
Sources of Energy
Replies: 0
Views: 104
Topic
What are the advantages and disadvantages of using a solar cooker?
3 years ago
Forum
Sources of Energy
Replies: 0
Views: 95
Topic
Name that part of a box-type solar cooker which allows the sun’s heat rays to enter the box but does not allow inside heat to go out. (b) Explain why, a plane mirror reflector is used in a box-type solar cooker.
3 years ago
Forum
Sources of Energy
Replies: 0
Views: 78
Topic
What kind of mirror, concave, convex or plane, would be best suited for use in a solar cooker? Why?
3 years ago
Forum
Sources of Energy
Replies: 0
Views: 62
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