In a hydroelectric power plant, the amount of electric power generated can be increased if water falls from a greater height as:

its temperature increases with height.

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available potential energy increases with height.

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the electricity content of water increases with height.

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more water molecules dissociate into ions at greater height.

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Solution

The correct option is B
available potential energy increases with height.

A hydro electric power plant converts available potential energy of water in to kinetic energy. This kinetic energy is in turn used to rotate turbine and generate electrical energy.

Potential Energy depends on height of the body. Water at greater height has more potential energy, thus more electrical power can be generated.

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Q. Question 13
In a hydroelectric power plant more electrical power can be generated if water falls from a greater height because

(a) its temperature increases
(b) larger amount of potential energy is converted into kinetic energy
(c) the electricity content of water increases with height
(d) more water molecules dissociate into ions

In a hydroelectric power plant, water falls at a rate of 1000 $\frac{k g}{s}$ from a height of 100m. Assuming that 50% of the energy of falling water is converted into electrical energy, calculate the power generated per second.

Assertion: The amount of electric power generated in hydroelectric power plant A is more than that of hydroelectric power plant B.
Reason: The potential energy possessed by the stored water is converted into electricity.

At a hydroelectric power plant, the water pressure head is at a height of 300 m and the water flow available is 100 m³s⁻¹. If the turbine generator efficiency is 60%, estimate the electric power available from the plant (g= 9.8 m s⁻²).

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