The Tehri dam is the highest dam in India and one of the highest in the World. The Tehri dam withholds a reservoir of capacity ` 4 . 0 km^(3)` and surface area `52 km^(2)` . It is used for irrigation, municipal water supply and the generation of 1000 MW of hydro electricity. The Tehri Dam has been the object of protests. Environment activist Shri Sunder Lal Bahuguna led the "Anti Tehri Dam Movement" from 1980s to 2014. The protest was against the displacement of town inhabitants and environmental consequences of the weak ecosystem. The relocation of more than 1,00,000 people from the area has led to protracted legal battles over resettlement rights and ultimately resulted in the delayed completion of the project.
What happens when water from great heights is made to fall on blades of turbine ?

Explanation

### Step-by-Step Solution:

1. **Understanding the Concept of Potential Energy**:
- Water stored at a height in a dam possesses potential energy due to its elevated position. The potential energy (PE) can be calculated using the formula:
\[ PE = mgh \]
where \( m \) is the mass of the water, \( g \) is the acceleration due to gravity, and \( h \) is the height of the water above the turbine.
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