Tidal energy mainly makes use of

Question

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Option B: Potential energy of water

Explanation & Concepts:
Tidal energy power plants operate primarily by harvesting the potential energy stored in water due to the difference in sea levels between high and low tides. By creating a basin, a head is established, and the water is allowed to flow through turbines to generate electricity.

Working Principle: A barrage or dam is constructed across an estuary or bay. During high tide, water flows into the basin, filling it up; the gates are then closed. When the tide retreats (low tide), the water level outside the basin drops. The trapped water, now at a higher elevation, is released through turbines, converting its potential energy into mechanical energy and then into electrical energy.

Key Formulas: $E = \rho g A \int h dh$ — total potential energy in a tidal basin, where $\rho$ is water density, $g$ is gravity, $A$ is basin area, and $h$ is tidal range.; $P = \eta \rho g A h^2 / (2T)$ — average power output over a tidal cycle of period $T$.

Key Points: Tidal energy is a form of hydro-power that converts the energy obtained from tides into useful forms of power, mainly electricity.; The process relies on the periodic rise and fall of ocean levels caused by gravitational forces of the Moon and the Sun.; Potential energy is favored over kinetic energy designs for large-scale barrage systems due to head availability.; The energy density of water is approximately 800 times greater than air, making tidal current conversion efficient.

Advantages: Highly predictable compared to wind or solar energy.; Long lifespan of tidal infrastructure.; Zero operational greenhouse gas emissions.

Disadvantages: High initial capital cost for barrage construction.; Potential negative impact on marine ecosystems and sedimentation patterns.; Limited geographical availability to specific coastal regions.

Applications: Base-load electricity generation in coastal regions.; Direct mechanical power for pumping water (rare).; Integration into coastal flood protection systems.

Additional Info: While tidal streams use kinetic energy, the traditional 'Tidal Power' question refers to the potential energy stored in a tidal barrage system.. Kinetic energy devices are often referred to as Tidal Stream Generators, which are distinct from large-scale Tidal Barrage plants.

Answer: B is correct — Tidal energy extraction in barrage-based systems primarily utilizes the potential energy created by the height differential (head) of water trapped behind a dam during different tidal phases.

Exam Tip: In engineering exams, always distinguish between tidal barrage (potential energy) and tidal stream turbines (kinetic energy). If the question is generic, 'potential energy' is the standard textbook answer for tidal plants.

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Option A: Kinetic energy of water

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Option C: Both

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Option D: None of the above

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