Question

The minimum speed of necessary for the satisfactory working of a wind generator to produce electricity is about:
${\text{A}}{\text{. }}15km/h$
${\text{B}}{\text{. }}20m/h$
${\text{C}}{\text{. }}12m/h$
${\text{D}}{\text{. }}50km/h$

Answer 1

Over the course of a year, modern turbines can generate usable amounts of electricity over $90$ percent of the time. Here an example, that if the wind at a turbine and it reaches the cut-in speed of six to nine mph, also it takes that the turbine will start generating electricity.
As wind speeds increase so does electricity production.

Complete step by step answer:
Wind is the generation of electricity and it is called wind power. Wind power harvests the primary energy flow of the atmosphere generated from the uneven heating of the earth’s source by the sun.

Therefore, wind generation is indirect thanks to harnessing solar power.

The speed of the wind is an important element in rotating the turbines in the windmills for the generation of electricity. Windmills can't be found everywhere, it is often only found in highly windy areas or with the minimum wind speed of $15km/h$.
The wind speed of an electrical generator,

The rated wind speed is usually about $15{\text{ }}m/s{\text{ }}\left( {54{\text{ }}km/h,{\text{ }}34{\text{ }}mph} \right)$ which is about double the expected average speed of the wind.
Electricity is generated by wind turbines,

U.S. total annual Electricity generation from wind electricity generation in the United States increased from about 6 billion kilowatt-hours (kWh) to about $300$ billion kWh in $2019$. In $2019$ , wind turbines in the United States were the source of about $7.3\%$ of total U.S. utility-scale electricity generation.
So, the correct answer is an option $\left( A \right)$.

Note: The energy within the wind turns the blades around a rotor: the principle behind wind turbines is extremely simple. The shaft is connected to the rotor, which gives spins and its generator to make electricity.