🌊 Sources of Energy
Tidal Energy | ज्वारीय ऊर्जा
Class 10 CBSE Science | NCERT + Foundation + Competitive Preparation
🌊 Sources of Energy | Tidal Energy
1. Introduction | परिचय
English: Tidal energy is the energy obtained from the periodic rise and fall and movement of ocean water caused mainly by the gravitational interaction of the Moon and the Sun with the Earth.
हिन्दी: ज्वारीय ऊर्जा (Tidal Energy) समुद्र के जल के नियमित रूप से ऊपर उठने और नीचे जाने तथा उसके प्रवाह से प्राप्त ऊर्जा है। ज्वार-भाटा मुख्यतः पृथ्वी, चंद्रमा और सूर्य के गुरुत्वीय प्रभाव के कारण उत्पन्न होता है।
हिन्दी: ज्वारीय ऊर्जा (Tidal Energy) समुद्र के जल के नियमित रूप से ऊपर उठने और नीचे जाने तथा उसके प्रवाह से प्राप्त ऊर्जा है। ज्वार-भाटा मुख्यतः पृथ्वी, चंद्रमा और सूर्य के गुरुत्वीय प्रभाव के कारण उत्पन्न होता है।
Gravitational Interaction → Tides → Moving Water → Turbine → Generator → Electricity
Exam Point: Tidal energy is a form of renewable energy because tides are naturally recurring.
परीक्षा बिंदु: ज्वारीय ऊर्जा renewable energy का एक रूप है क्योंकि ज्वार-भाटा प्राकृतिक रूप से बार-बार आता है।
परीक्षा बिंदु: ज्वारीय ऊर्जा renewable energy का एक रूप है क्योंकि ज्वार-भाटा प्राकृतिक रूप से बार-बार आता है।
2. What are Tides? | ज्वार-भाटा क्या है?
A tide is the periodic rise and fall of sea level.
High Tide: Sea level rises.
Low Tide: Sea level falls.
The Moon has the strongest tidal influence because it is much closer to Earth than the Sun, although the Sun also contributes significantly.
हिन्दी: समुद्र के जल स्तर का नियमित रूप से ऊपर उठना ज्वार (High Tide) और नीचे जाना भाटा (Low Tide) कहलाता है।
High Tide: Sea level rises.
Low Tide: Sea level falls.
The Moon has the strongest tidal influence because it is much closer to Earth than the Sun, although the Sun also contributes significantly.
हिन्दी: समुद्र के जल स्तर का नियमित रूप से ऊपर उठना ज्वार (High Tide) और नीचे जाना भाटा (Low Tide) कहलाता है।
3. Cause of Tides | ज्वार-भाटा का कारण
Important: Tides are caused by gravitational effects and the motion of the Earth-Moon system. The Moon's tidal influence is stronger than the Sun's because the Moon is much closer to Earth.
4. High Tide and Low Tide | उच्च ज्वार और निम्न ज्वार
| High Tide | ज्वार | Low Tide | भाटा |
|---|---|
| Sea level rises. | Sea level falls. |
| Water moves toward a higher tidal level. | Water recedes toward a lower tidal level. |
| Can provide potential energy/flow for tidal systems. | Can also provide useful flow during ebb-tide systems. |
5. Tidal Energy Conversion | ज्वारीय ऊर्जा का विद्युत में परिवर्तन
Tidal energy systems convert the energy associated with changing water levels or tidal currents into mechanical energy and then electricity.
ज्वारीय ऊर्जा प्रणालियाँ जल स्तर के अंतर या tidal currents में मौजूद ऊर्जा को पहले mechanical energy और फिर electrical energy में बदलती हैं।
ज्वारीय ऊर्जा प्रणालियाँ जल स्तर के अंतर या tidal currents में मौजूद ऊर्जा को पहले mechanical energy और फिर electrical energy में बदलती हैं।
Tidal Water Movement → Turbine Rotation → Generator → Electrical Energy
6. Animated Tidal Power Plant | ज्वारीय विद्युत संयंत्र
7. Methods of Harnessing Tidal Energy
There are different approaches to harnessing tidal energy.
| Method | Basic Idea |
|---|---|
| Tidal Barrage | A dam-like structure across a suitable estuary creates a water-level difference and channels water through turbines. |
| Tidal Stream System | Underwater turbines are placed in strong tidal currents and are driven by moving water. |
| Tidal Lagoon | A specially constructed coastal enclosure creates a controlled water-level difference that can drive turbines. |
8. Tidal Barrage | ज्वारीय बाँध
A tidal barrage is a dam-like structure built across a suitable estuary or coastal inlet.
The difference in water level between the sea and the basin can cause water to flow through turbines. The turbines rotate and drive generators.
हिन्दी: Tidal barrage समुद्र के उपयुक्त तटीय भाग या estuary पर बनाया गया बाँध जैसा ढाँचा है। जल स्तर में अंतर के कारण जल turbine से होकर गुजरता है और बिजली उत्पन्न की जा सकती है।
The difference in water level between the sea and the basin can cause water to flow through turbines. The turbines rotate and drive generators.
हिन्दी: Tidal barrage समुद्र के उपयुक्त तटीय भाग या estuary पर बनाया गया बाँध जैसा ढाँचा है। जल स्तर में अंतर के कारण जल turbine से होकर गुजरता है और बिजली उत्पन्न की जा सकती है।
9. Tidal Stream Energy | ज्वारीय धाराओं की ऊर्जा
Tidal stream systems use the kinetic energy of fast-moving tidal currents. Underwater turbines are similar in principle to wind turbines, except that moving water turns the blades instead of moving air.
Tidal stream turbines are often installed where tidal currents are sufficiently strong.
Tidal stream turbines are often installed where tidal currents are sufficiently strong.
Moving Tidal Water → Turbine → Generator → Electricity
10. Tidal Lagoon | ज्वारीय लैगून
A tidal lagoon is a constructed coastal enclosure designed to capture differences in water level between the sea and the lagoon.
Water is allowed to flow through turbines under suitable tidal conditions.
Water is allowed to flow through turbines under suitable tidal conditions.
11. Why is Tidal Energy Renewable? | नवीकरणीय क्यों?
Tides occur repeatedly due to the gravitational interaction of the Earth, Moon and Sun and the motion of the Earth-Moon system. Therefore, tidal energy is naturally replenished.
ज्वार-भाटा पृथ्वी, चंद्रमा और सूर्य के गुरुत्वीय प्रभाव तथा पृथ्वी-चंद्रमा प्रणाली की गति से नियमित रूप से उत्पन्न होता है। इसलिए tidal energy renewable source है।
ज्वार-भाटा पृथ्वी, चंद्रमा और सूर्य के गुरुत्वीय प्रभाव तथा पृथ्वी-चंद्रमा प्रणाली की गति से नियमित रूप से उत्पन्न होता है। इसलिए tidal energy renewable source है।
12. Advantages of Tidal Energy | लाभ
- Renewable: Tides are naturally recurring.
- Predictable: Tidal cycles can be predicted much more accurately than many weather-dependent renewable resources.
- Low operational emissions: Electricity generation does not require conventional fossil-fuel combustion.
- High energy density: Water is much denser than air, so moving water can carry substantial kinetic energy.
- Long-term resource: The underlying tidal cycle is naturally maintained.
- No fuel transport: There is no continuous requirement to transport coal or petroleum fuel to the turbine.
13. Limitations of Tidal Energy | सीमाएँ
- Suitable coastal locations are limited.
- Construction of barrages and marine structures can be expensive.
- Large projects may alter estuary and coastal ecosystems.
- Marine engineering and maintenance can be difficult because of corrosion and harsh conditions.
- Power output follows tidal cycles rather than being constant at every moment.
- Large barrages may affect sediment transport, fish movement and local habitats.
14. Tidal Energy vs Hydroelectric Energy
| Tidal Energy | Hydroelectric Energy |
|---|---|
| Uses movement or level differences caused by tides. | Uses water stored at height in reservoirs or flowing rivers. |
| Strongly associated with coastal regions. | Often associated with rivers and mountainous regions. |
| Tidal cycles are predictable. | Output depends strongly on water availability and reservoir conditions. |
| Uses seawater in many systems. | Usually uses freshwater. |
15. Tidal Energy vs Wind Energy
| Tidal Energy | Wind Energy |
|---|---|
| Uses moving seawater. | Uses moving air. |
| Water is much denser than air. | Air has much lower density than water. |
| Tidal cycles are highly predictable. | Wind speed varies with weather and location. |
| Requires suitable coastal or underwater sites. | Requires suitable windy sites. |
16. Energy Conversion in Tidal Power Plant
🌙 Moon + ☀️ Sun + 🌍 Earth
↓
🌊 Tidal Movement
↓
💧 Moving Water
↓
⚙️ Turbine
↓
🔄 Generator
↓
⚡ Electrical Energy
↓
🌊 Tidal Movement
↓
💧 Moving Water
↓
⚙️ Turbine
↓
🔄 Generator
↓
⚡ Electrical Energy
17. Environmental Considerations | पर्यावरणीय प्रभाव
Tidal energy produces electricity without conventional fuel combustion, but large marine projects can affect coastal environments.
Possible impacts include changes in sediment movement, water circulation, fish migration, estuarine habitats and marine ecosystems.
Therefore, environmental assessment and careful site selection are important before constructing large tidal projects.
Possible impacts include changes in sediment movement, water circulation, fish migration, estuarine habitats and marine ecosystems.
Therefore, environmental assessment and careful site selection are important before constructing large tidal projects.
18. Important Terms | महत्वपूर्ण शब्द
| Term | Meaning |
|---|---|
| High Tide | Periodic rise in sea level. |
| Low Tide | Periodic fall in sea level. |
| Tidal Current | Horizontal movement of seawater associated with tides. |
| Tidal Barrage | Dam-like structure used to exploit tidal water-level differences. |
| Tidal Stream | Flow of seawater driven by tidal movement. |
| Tidal Lagoon | Constructed coastal enclosure used to exploit tidal water-level differences. |
| Estuary | Coastal region where a river meets the sea, often influenced by tides. |
19. 30 MCQs | बहुविकल्पीय प्रश्न
1. Tidal energy is obtained mainly from:
A. Periodic movement of ocean water
B. Burning coal
C. Sunlight alone
D. Underground magma
Answer: A
2. The main gravitational body responsible for tides is:
A. Mars
B. Moon
C. Jupiter
D. Venus
Answer: B
3. The periodic rise of sea level is called:
A. Low tide
B. Current
C. High tide
D. Wave reflection
Answer: C
4. Tidal energy is classified as:
A. Fossil energy
B. Nuclear energy
C. Non-renewable energy
D. Renewable energy
Answer: D
5. A tidal barrage is similar in basic structure to a:
A. Dam
B. Solar cell
C. Chimney
D. Battery
Answer: A
6. A tidal stream turbine uses:
A. Coal
B. Moving seawater
C. Natural gas
D. Hot rocks
Answer: B
7. The turbine in a tidal power system converts water energy mainly into:
A. Chemical energy
B. Nuclear energy
C. Mechanical rotational energy
D. Sound energy
Answer: C
8. A generator converts:
A. Electrical energy into water
B. Heat into coal
C. Chemical energy into water
D. Mechanical energy into electrical energy
Answer: D
9. Tidal energy has an important advantage over many weather-dependent sources because tides are:
A. Highly predictable
B. Random
C. Caused by rainfall
D. Available only once a year
Answer: A
10. Which is NOT a tidal energy technology?
A. Tidal barrage
B. Tidal stream turbine
C. Tidal lagoon
D. Coal furnace
Answer: D
11. The Sun also affects:
A. Tides
B. Earth's core temperature only
C. Coal formation directly
D. Nuclear fission
Answer: A
12. Tidal stream systems mainly use:
A. Moving air
B. Kinetic energy of moving seawater
C. Chemical energy of seawater
D. Solar heat
Answer: B
13. A tidal lagoon is:
A. An underground coal mine
B. A solar pond
C. A constructed coastal enclosure
D. A nuclear reactor
Answer: C
14. Which body has stronger tidal influence on Earth?
A. Moon
B. Mars
C. Jupiter
D. Saturn
Answer: A
15. Tidal power plants are particularly suitable near:
A. Deserts only
B. Suitable coastal areas
C. Mountain tops only
D. Dry forests
Answer: B
16. One limitation of tidal energy is:
A. No predictable cycle
B. It requires coal
C. Suitable sites are limited
D. It cannot move turbines
Answer: C
17. High tide means:
A. Sea level is relatively high
B. Sea level is zero
C. No water movement
D. Ocean water freezes
Answer: A
18. Low tide means:
A. Maximum rainfall
B. Relatively low sea level
C. Maximum sunlight
D. Maximum wind speed
Answer: B
19. Water is useful for tidal turbines because it has:
A. Very low density
B. No kinetic energy
C. Relatively high density
D. No mass
Answer: C
20. A possible environmental concern of large tidal barrages is:
A. Change in estuarine ecosystems
B. Creation of coal
C. Ozone production
D. Nuclear radiation
Answer: A
21. Tidal energy ultimately depends on:
A. Gravitational interactions and Earth's motion
B. Coal combustion
C. Uranium fission
D. Petroleum refining
Answer: A
22. The water movement in a tidal barrage can rotate:
A. A solar panel
B. A turbine
C. A battery
D. A transformer only
Answer: B
23. Tidal energy does not require:
A. Tidal movement
B. Suitable coastal conditions
C. Continuous combustion of fossil fuel
D. Turbine systems in many electricity projects
Answer: C
24. Tidal current means:
A. Horizontal movement of seawater associated with tides
B. Underground water only
C. Rainfall
D. Ocean evaporation
Answer: A
25. Which sequence is correct?
A. Tidal movement → turbine → generator → electricity
B. Electricity → tide → coal
C. Coal → tide → generator
D. Sunlight → coal → tide
Answer: A
26. Which is more predictable?
A. Random gusts of wind
B. Tidal cycles
C. Individual clouds
D. Lightning
Answer: B
27. Tidal energy is a form of:
A. Ocean energy
B. Fossil energy
C. Nuclear energy
D. Chemical fuel
Answer: A
28. The main purpose of a tidal barrage is to:
A. Burn coal
B. Create a usable water-level difference and flow
C. Produce petroleum
D. Block all ocean movement permanently
Answer: B
29. Tidal stream turbines are generally installed:
A. In suitable strong tidal currents
B. Inside deserts
C. Inside volcanoes
D. On dry rooftops
Answer: A
30. The best definition of tidal energy is:
A. Energy obtained from recurring movement of ocean water caused by tides
B. Energy obtained from coal
C. Energy obtained only from sunlight
D. Energy obtained from nuclear fuel
Answer: A
20. 30 Subjective Questions with Answers
2 Marks
Q1. What is tidal energy?
Tidal energy is energy obtained from the periodic movement and level changes of ocean water caused mainly by the gravitational effects of the Moon and Sun.
2 Marks
Q2. What is a tide?
A tide is the periodic rise and fall of sea level.
2 Marks
Q3. What is high tide?
High tide is the periodic rise in sea level.
2 Marks
Q4. What is low tide?
Low tide is the periodic fall in sea level.
2 Marks
Q5. Which celestial body has the strongest tidal influence on Earth?
The Moon has the strongest tidal influence because it is much closer to Earth than the Sun.
3 Marks
Q6. Why is tidal energy renewable?
Tides occur naturally and repeatedly due to gravitational interactions and the motion of the Earth-Moon system. Therefore, the resource is naturally replenished.
3 Marks
Q7. What is a tidal barrage?
A tidal barrage is a dam-like structure built across a suitable coastal inlet or estuary to exploit tidal water-level differences and water flow through turbines.
3 Marks
Q8. What is a tidal stream turbine?
It is an underwater turbine that uses the kinetic energy of moving tidal currents to produce mechanical rotation and electricity.
3 Marks
Q9. What is a tidal lagoon?
A tidal lagoon is a constructed coastal enclosure designed to exploit the difference in water levels between the sea and the lagoon during tidal cycles.
3 Marks
Q10. Write three advantages of tidal energy.
It is renewable, highly predictable and does not require conventional fossil-fuel combustion during electricity generation.
3 Marks
Q11. Write three limitations of tidal energy.
Suitable sites are limited, marine construction can be expensive and large projects can affect coastal ecosystems.
4 Marks
Q12. Explain how tidal energy is converted into electricity.
Tidal movement causes water to flow. The moving water passes through or turns a turbine. The turbine rotates a generator. The generator converts mechanical energy into electrical energy.
4 Marks
Q13. Explain the working of a tidal barrage.
A barrage is constructed across a suitable estuary or coastal inlet. Tidal water creates a difference in water level between the sea and basin. Water flows through turbine passages. The turbines rotate and drive generators to produce electricity.
4 Marks
Q14. Differentiate between high tide and low tide.
High tide is the periodic rise in sea level, whereas low tide is the periodic fall in sea level. Both are parts of the regular tidal cycle.
4 Marks
Q15. Why is tidal energy considered predictable?
The positions and motions of the Earth, Moon and Sun can be calculated accurately. Therefore, the timing of tidal cycles can be predicted much more accurately than many short-term weather-dependent resources.
4 Marks
Q16. Compare tidal stream and tidal barrage systems.
Tidal stream systems use the kinetic energy of moving tidal currents with underwater turbines. Tidal barrage systems use a structure to create or exploit water-level differences and channel water through turbines.
5 Marks
Q17. Explain the advantages and limitations of tidal energy.
Advantages include renewable supply, high predictability, high energy density of moving water and no conventional fuel combustion. Limitations include limited suitable sites, high marine construction costs, corrosion and maintenance issues, and possible effects on coastal ecosystems.
5 Marks
Q18. Explain the role of the Moon and Sun in producing tides.
The Moon's gravitational attraction produces the largest tidal influence because of its proximity to Earth. The Sun also exerts gravitational influence. Their combined effects, along with Earth's motion, produce regular variations in ocean water levels and currents.
5 Marks
Q19. Why are tidal energy projects mainly located in coastal areas?
Tidal energy requires significant changes in sea level or strong tidal currents. These conditions occur naturally in suitable coastal regions, estuaries and channels. Inland areas generally do not have the required tidal movement.
5 Marks
Q20. Explain environmental concerns associated with tidal barrages.
Large barrages can alter tidal flow, sediment movement and water circulation. They may affect fish migration, estuarine habitats and other coastal ecosystems. Proper environmental assessment and careful design are therefore necessary.
6 Marks
Q21. Explain tidal energy in detail.
Tidal energy is obtained from the periodic movement and level changes of ocean water. These tides are mainly produced by gravitational interactions involving the Moon and Sun. Tidal barrages, tidal stream turbines and tidal lagoons can harness this energy. Moving water turns turbines, which drive generators to produce electricity. Tidal energy is renewable and predictable, but suitable sites are limited and marine projects can be expensive and environmentally sensitive.
6 Marks
Q22. Describe the complete energy conversion chain in a tidal power plant.
Gravitational interactions produce tides. Tidal water develops potential or kinetic energy. Water flows through a turbine or directly turns an underwater turbine. The turbine converts water energy into mechanical rotation. A generator converts mechanical energy into electrical energy.
6 Marks
Q23. Compare tidal energy with hydroelectric energy.
Tidal energy uses recurring ocean tides and currents, mainly in coastal regions. Hydroelectric energy generally uses water stored at elevation or river flow. Tidal cycles are highly predictable, while hydroelectric output depends on river flow, rainfall and reservoir management. Tidal systems commonly use seawater, whereas hydroelectric systems usually use freshwater.
6 Marks
Q24. Compare tidal energy with wind energy.
Tidal energy uses moving seawater while wind energy uses moving air. Water has much higher density than air, so moving water can carry substantial energy. Tidal cycles are highly predictable, whereas wind varies with weather. Both are renewable sources and require suitable locations.
6 Marks
Q25. Why is tidal energy considered a clean energy source?
Tidal electricity generation does not require conventional combustion of coal, oil or gas. Therefore, it avoids the direct combustion emissions associated with fossil-fuel power plants during normal operation. However, construction and marine environmental impacts still need to be considered.
6 Marks
Q26. What factors should be considered before constructing a tidal power plant?
Important factors include tidal range or current speed, coastal geometry, water depth, geological conditions, environmental impacts, distance from the electricity grid, construction cost, marine accessibility and long-term maintenance requirements.
6 Marks
Q27. Why are tidal currents suitable for underwater turbines?
Tidal currents contain kinetic energy because seawater is moving. Water is much denser than air, so a strong current can exert substantial force on turbine blades. The rotating turbine can drive a generator.
6 Marks
Q28. Explain the difference between potential and kinetic tidal energy.
Potential tidal energy is associated with the difference in water levels between the sea and a basin. Kinetic tidal energy is associated with the motion of tidal currents. Barrages mainly exploit water-level differences, while tidal stream turbines exploit moving water.
6 Marks
Q29. Why can tidal energy not completely replace all other energy sources?
Tidal resources are geographically limited, output follows tidal cycles, projects can have high capital costs and large marine structures may affect ecosystems. Therefore, tidal energy is best considered as one component of a diverse renewable-energy system.
6 Marks
Q30. Write an exam-ready note on Tidal Energy.
Tidal energy is renewable energy obtained from the periodic rise, fall and movement of ocean water caused mainly by gravitational interactions of the Moon and Sun with Earth. Tidal barrages, tidal stream turbines and tidal lagoons can harness it. The moving water drives turbines connected to generators. It is highly predictable and does not require fossil-fuel combustion, but suitable locations are limited and marine projects may be expensive and environmentally sensitive.
21. Assertion–Reason | कथन–कारण
Q1. Assertion: Tidal energy is a renewable source of energy.
Reason: Tides occur naturally and repeatedly.
Reason: Tides occur naturally and repeatedly.
Answer: Both Assertion and Reason are true, and the Reason correctly explains the Assertion.
Q2. Assertion: The Moon has a stronger tidal influence than the Sun.
Reason: The Moon is much closer to Earth than the Sun.
Reason: The Moon is much closer to Earth than the Sun.
Answer: Both are true, and the Reason correctly explains the Assertion.
Q3. Assertion: Tidal stream turbines use moving seawater.
Reason: Moving seawater possesses kinetic energy.
Reason: Moving seawater possesses kinetic energy.
Answer: Both are true, and the Reason correctly explains the Assertion.
Q4. Assertion: Tidal energy is available equally at every location.
Reason: Tidal range and current speed vary from place to place.
Reason: Tidal range and current speed vary from place to place.
Answer: Assertion is false, but Reason is true.
Q5. Assertion: Tidal barrages can affect coastal ecosystems.
Reason: A barrage can modify tidal flow and sediment movement.
Reason: A barrage can modify tidal flow and sediment movement.
Answer: Both are true, and the Reason correctly explains the Assertion.
22. HOTS / Competency-Based Questions
HOTS 1: Why can tidal power be predicted more accurately than wind power?
Tides are governed mainly by predictable astronomical motions of the Earth-Moon-Sun system, whereas wind depends strongly on changing atmospheric conditions.
HOTS 2: A coastal region has very weak tidal currents. Why may a tidal stream project not be suitable there?
Weak currents contain less kinetic energy and may not provide sufficient force or power to operate turbines economically.
HOTS 3: Why is water's density important in tidal energy?
Water is much denser than air, so moving water can transfer substantial force and kinetic energy to turbine blades.
HOTS 4: Why can a tidal barrage affect fish populations?
The barrage can change water flow, migration pathways, salinity and habitat conditions, potentially affecting fish movement and aquatic ecosystems.
HOTS 5: Why is tidal energy called renewable but not completely impact-free?
The tidal resource is naturally replenished, but constructing and operating marine infrastructure can still affect habitats, sediments, water flow and marine organisms.
23. Golden Points | परीक्षा के लिए महत्वपूर्ण बिंदु
- Tidal energy comes from recurring movement of ocean water.
- Tides are caused mainly by gravitational interactions involving the Moon and Sun.
- The Moon has the stronger tidal influence because it is closer to Earth.
- High tide = rise in sea level.
- Low tide = fall in sea level.
- Tidal energy is renewable.
- Tidal cycles are highly predictable.
- Tidal barrage uses water-level differences.
- Tidal stream systems use moving tidal currents.
- Tidal lagoon uses a constructed coastal enclosure.
- Turbine converts water energy into mechanical energy.
- Generator converts mechanical energy into electrical energy.
- Water has much higher density than air.
- Suitable tidal sites are geographically limited.
- Marine structures may affect coastal ecosystems.
- Tidal energy does not require conventional fossil-fuel combustion during generation.
24. One-Minute Revision | एक मिनट में Revision
🌙 Moon + ☀️ Sun
↓
🌊 Tides
↓
💧 Moving Water / Water-Level Difference
↓
⚙️ Turbine
↓
🔄 Generator
↓
⚡ Electricity
↓
🌊 Tides
↓
💧 Moving Water / Water-Level Difference
↓
⚙️ Turbine
↓
🔄 Generator
↓
⚡ Electricity
Source: Tidal movement
Main cause: Gravitational interaction
Main celestial influence: Moon
Technologies: Barrage, Tidal Stream, Tidal Lagoon
Main machine: Turbine
Output: Electrical energy
Nature: Renewable + highly predictable
Main limitation: Limited suitable coastal sites
Main cause: Gravitational interaction
Main celestial influence: Moon
Technologies: Barrage, Tidal Stream, Tidal Lagoon
Main machine: Turbine
Output: Electrical energy
Nature: Renewable + highly predictable
Main limitation: Limited suitable coastal sites
25. Concept Map | अवधारणा मानचित्र
26. Final Summary | अंतिम सारांश
Tidal energy is the energy obtained from the recurring movement and level changes of ocean water. The tides are produced mainly by gravitational interactions involving the Moon and Sun and the motion of the Earth-Moon system.
The main approaches to harness tidal energy are tidal barrages, tidal stream turbines and tidal lagoons. Moving water turns turbines, and generators convert the resulting mechanical energy into electrical energy.
Tidal energy is renewable and highly predictable. However, suitable sites are limited, marine construction can be costly, and large projects may affect coastal and estuarine ecosystems.
Final Memory Line:
🌊 Tides → Moving Water → Turbine → Generator → Electricity
The main approaches to harness tidal energy are tidal barrages, tidal stream turbines and tidal lagoons. Moving water turns turbines, and generators convert the resulting mechanical energy into electrical energy.
Tidal energy is renewable and highly predictable. However, suitable sites are limited, marine construction can be costly, and large projects may affect coastal and estuarine ecosystems.
Final Memory Line:
🌊 Tides → Moving Water → Turbine → Generator → Electricity
📘 Class 10 CBSE Science
Sources of Energy | Tidal Energy
NCERT + Foundation + Competitive Preparation
Sources of Energy | Tidal Energy
NCERT + Foundation + Competitive Preparation
