Question

The power generated in a windmill:
(A) Is more in rainy season since damp air would make air mass hitting the blades
(B) Depends on the height of the tower
(C) Depends on the wind velocity
(D) Can be increased by planting tall trees close to the tower

Answer 1

Hint
It is known that when work is done on an object, energy is transferred. The rate at which this energy is transferred is called power. So, the more powerful a device is, the more energy it will transfer each second. In physics however, it has a very specific meaning. It is a measure of the rate at which work is done or similarly, at which energy is transferred. The ability to accurately measure power was one of the key abilities which allowed early engineers to develop the steam engines which drove the industrial revolution. The sign of power is just a matter of definition. Energy can increase or decrease, but the energy itself cannot be negative. As we said, power is just the time rate of change of energy, so it can be negative. But energy is only positive.

Complete step by step answer
We know that windmills are used to generate power from the winds. It converts wind energy to electrical energy. The power generated in a windmill depends on the velocity of the wind. If the velocity of the wind is higher, the windmill will generate more power. If the velocity of the wind is lower, the windmill will produce less power. In general, wind speed requires a minimum of 8 kph (2 m/s) to start rotating most small wind turbines. Hence, we can see that the power generated in a windmill depends on the velocity of the wind.

Therefore, the correct answer is Option (C).

Note
We know that the windmill is a type of working engine. The energy made by windmills can be used in many ways. These include grinding grain or spices, pumping water and sawing wood. Modern wind power machines are used to create electricity. These are called wind turbines by engineers or windmills by the average person. They are known as machines driven by wind power. They are constructed to collect the kinetic energy of the wind and their biggest and most important role is that they have the ability to convert wind energy into electricity. Windmills are always working together to force their action to be stronger and more efficient.