The system can be powered from a mains supply, rechargeable battery pack or even solar sources.
Such motors are extremely efficient, and can be powered from a station's solar panels.
Pipistrel Taurus G4 airplane has demonstrated an extremely efficient flight powered from electric batteries at the Nasa Green Flight Challenge.
A We just committed to build a community in California that will be powered from solar panels.
In September, in a hangar in Huntsville, Ala., NASA engineers flew a small propeller-driven model plane powered from the ground by a beam of laser light.
Terribly slight, long necked, thin-legged, powered from the torso rather than the backside, which in both cases was improbably small.
Isner used his huge serve — powered from his 6-foot-9 frame — but also showed surprising touch in dominating De Voest.
The company also delivered a trio of new iBooks and paraded an Airport base station that doesn't need to be powered from the electricity mains.
He powered from behind the net to score his first goal, then redirected Jacob Trouba's slap shot from the blue line midway through the second period.
In Tahrir Square, the crowds huddled around speakers powered from lamp-posts or made phone calls to relatives who held their handsets close to televisions.
As treasurer of his Santa Monica condominium association, Mr. Silver has seen electric bills plummet for the common areas, which are powered from a solar array.
