A city gets its electricity from a dam, where water is stored in a reservoir. How does the water provide the city with its power?

1 answer

The city receives its electricity from the dam through a process called hydroelectric power generation. Here's how it works:

  1. Water Storage: The dam creates a reservoir by blocking a river, which allows water to be stored at a higher elevation. The potential energy of the water in the reservoir is harnessed for power generation.

  2. Water Release: When electricity is needed, water from the reservoir is released through openings in the dam called spillways or sluices. The flow of water is carefully controlled to manage the amount of electricity produced.

  3. Turbine Rotation: As the water flows downward due to gravity, it passes through turbines located at the base of the dam. The force of the falling water causes these turbines to spin.

  4. Generator Operation: The turbines are connected to generators. As the turbines rotate, they drive the generators, which convert the mechanical energy of the spinning turbines into electrical energy through electromagnetic induction.

  5. Electricity Distribution: The generated electricity is then transmitted through power lines to the city and surrounding areas, where it is used to power homes, businesses, and other facilities.

The efficiency and capacity of hydroelectric power depend on factors such as the height from which the water falls (hydraulic head) and the volume of water available. This renewable energy source is considered environmentally friendly compared to fossil fuels, as it produces no direct emissions during operation. However, it can have ecological impacts on local wildlife and water ecosystems.