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Wind energy can be harnessed if the wind speed at the location is at least about:
A3 km per hour
B300 km per hour
C75 km per hour
D15 km per hour
Answer & Solution
Correct answer: D. 15 km per hour
1. Wind turbines need a minimum air flow to overcome friction.
2. Below about 15 km per hour the blades produce too little torque.
3. Useful electricity production starts above this threshold.
4. So wind speed should be at least about 15 km/h.
5. Very high winds need brakes to prevent damage.
_Source: NCERT Class 10 Science Ch 14 'Sources of Energy' (byjus.com extract)_
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