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The schematic of hydroelectric plant is ...

The schematic of hydroelectric plant is shown in Figure 5.17 on textbook . Water from about middle of the total height of the dam is taken to the turbine, as shown by point B in the diagram.
What will be the effect on electricity generation, if the channel taking water to turbine starts at point A?

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If the channel taking water to turbine starts at point A, then the water will flow with a greater speed. Since point A is at height, water will acqure speed. This will result into more efficient rotation of the blades of turbine. The electricity generation will thus become more efficient.
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