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Get CBSE Notes for Class 10 Science Chapter 14. Sources of Energy: Non-Conventional Sources of Energy prepared by experts as per the latest NCERT syllabus and CBSE exam pattern. These concise and easy-to-understand notes cover important definitions, formulas, diagrams, and key concepts from the chapter to help students in quick revision and effective exam preparation. Whether you are studying for school tests, board exams, or competitive exams, these notes provide a reliable study resource. Designed in simple language with point-wise explanations, they save time and enhance learning efficiency. Download free PDF notes, explore solved examples, and strengthen your understanding of [Topic Name] for scoring high marks. Perfect for Class 10 students who want clear, structured, and exam-oriented notes for CBSE Science.
Non-Conventional/Alternative Sources of Energy
Causes to look at alternative sources of energy:
(i) The demand of energy increasing day by day, but these all demands cannot be completed by conventional sources of energy.
(ii) Conventional sources are limited in nature.
(iii) Conventional sources like fossil fuels are very low that can be finished in future.
(iv) The Most of the conventional sources of energy is non-renewable.
1. Solar Energy:
The energy obtained from sun is known as solar energy.
Uses of solar energy:
There are two technologies in which solar energy is used.
(A) Solar Cooker
(B) Solar Panel
(A) Solar Cooker:
Solar cooker is a device which is used to cook food by using solar energy.
Principle of solar energy:
There are two principles on which solar cooker works.
(i) Black colour absorbs more heat than other.
(ii) Use of glass plate which produces green-house effect inside the cooker.
Structure and function of Solar cooker:
Solar cooker just like a box and its internal surfaces are coloured with black colour. Solar cookers are covered with a glass plate. Which traps heats to go out from box and shows green house effect. A black surface absorbs more heat as compared to a white or a reflecting surface under identical conditions. Solar cookers and solar water heaters use this property in their working. Some solar cookers achieve a higher temperature by using mirrors to focus the rays of the Sun.
(B) Solar Panel :
A large number of solar cells are, combined in an arrangement called solar cell panel that can deliver enough electricity for practical use.
Solar Cells: Solar cells are devices which are made of silicon and they convert solar energy to electrical energy.
Three uses of solar cells.
(i) Artificial satellites and space probes like Mars orbiters use solar cells as the main source of energy.
(ii) Radio or wireless transmission systems or TV relay stations in remote locations use solar cell panels.
(iii) Traffic signals, calculators and many toys are fitted with solar cells.
Advantage of solar cells:
(i) They have no moving parts, require little maintenance.
(ii) They work quite satisfactorily without the use of any focussing device.
(iii) They can be set up in remote area where laying of a power transmission line
is more expensive and not commercially viable.
(iv) It is alternative source of energy.
(v) It does not produce pollutions and does not harm environment.
Limitation of solar cells:
(i) These devices are useful only at certain times during the day.
(ii) They do not perform good work during rainy days.
(iii) There is limited production of electricity by solar cells.
(iv) They have high cost and low efficiency.
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Ace your exams with CBSE Notes for Class 10 Science chapter 14. Sources of Energy: Non-Conventional Sources of Energy. These notes provide a clear explanation of important concepts, formulas, diagrams, and solved examples from the NCERT syllabus. Specially designed for Class 10 students, the notes are structured in a simple, point-wise manner to make revision quick and effective. Whether you are preparing for school tests, board exams, or competitive exams, these Science notes will boost your confidence and save valuable study time. You can also download Science class 10 chapter 14. Sources of Energy free PDF notes for offline learning. With easy-to-grasp language, exam tips, and well-organized content, these CBSE Science notes on chapter 14. Sources of Energy – Non-Conventional Sources of Energy are the perfect study companion for scoring high marks and mastering the subject.
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