Assertion: small windmill | /r/HasProperty | effective
Facets:
Source sentences:
text: Even a small windmill (2 meters) can be effective: 20 mph 10% of the time 2500 KWH annually 40 mph 10% of the time 20000 KWH annually 20 mph 50% of the time 12500 KWH annually 4 small windmills at 20 mph 10% of the time 10000 KWH annually