So today, most turbines are well over 100 meters tall, with equally large rotor diameters. A turbine of this height and size can capture a huge amount of wind, generating enough electricity every year to power 750 American homes. A wind farm of...
Wind power offers another way to harness weather for energy production, and although they're not quite as common as solar energy systems, wind generators are actually more efficient. Wind power systems rely on wind turbines — windmills — that catch the wind with propeller-like blades. This tu...
“The power available to a wind turbine is based on the density of the air (usually about 1.2 kg/m3), the swept area of the turbine blades (picture a big circle being made by the spinning blades), and the velocity of the wind. Of these, clearly, the most variable input is wind spe...
When you hear the phrase "alternative energy," chances are your mind goes to windmills and solar panels, or perhaps fields of corn. Few people think of human beings as a renewable energy source. But a new lamp design taps into just that idea. It's not a new concept: Wind-up watches ...
So today, most turbines are well over 100 meters tall, with equally large rotor diameters. A turbine of this height and size can capture a huge amount of wind, generating enough electricity every year to power 750 American homes. A wind farm of 200 similarly sized turbines could power over...
Wind turbines – which we could define as "the windmills of the 21st century" – are fascinating machines that harness the power of the wind to move their blades, which then turn the generator that produces electricity. We’ll explain in five simple steps how they convert this natural resourc...
Joby's headquarters are tucked into the redwoods of the Santa Cruz Mountains, not far from the test site. The lodge-like main building is encased by tall windows and trussed with dark wooden beams; outside, there's a deck with barbecues and umbrella-topped tables, a shady lawn and ...
But you really are as you’ve been told before, the equivalent of a sad old man riding an old nag with a bashed out “soap plate helmet” on his head as armour, trying to charge but failing to hit the sails of real world near idling windmills imagined in the deluded mind as feroc...
I don’t remember what they are called, but there are kite-based sails that have been invented to help save fuel for modern ships. It flies in a big figure 8 in front of the ship… and similar kite sails can also be used for power generators (as opposed to electric windmills). ...
Cows love to eat grass, and they eat quite a lot! You needn’t be afraid of this quiet farm animal. But don’t run at a cow in a field or touch one, unless an adult (成年人) tells you it’s okay. Horses are big, beautiful animals, but they can be surprised easily. A horse...