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 C?

Explanation

If the channel taking water to turbine starts at point C, it will affect the electricity generation adversely. Point C is on the lower height as compared to the channel that carries water to the turbine. The flow of the water thus will be affected resulting into improper rotation of blades of turbine. This will certainly affect the electricity generation.