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The diagram illustrates a structure that is used to generate electricity by process of wave power.
In the first event, the air is flowing towards upward direction coming out of the column, causing the wave to flow through chamber and forcing turbine to move and produce the electricity
However, in the later case the air is moving towards the opposite direction and causing wave to flow away from the chamber and creating a suction above sea level, resulting the turbine to move again and produce the electricity with same efficiency.
It is clear from both the diagram that this setup for producing electricity is useful in both cases whether air flows inwards or outwards through column.
