If y’all think windmills are cool, think about a helicopter. How much gas is needed to spin the thing. Then you think backwards: how fast the windmill has to spin (how slow but big) to match the gas engine. mmmmmk?
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helicopter is gas>propeller; windmill is propeller>electricity. because gas engines have defined power output, say 1000 hp; then electricity has KWH. So we can compare the HP with KWH.