GRNG Exploratory Sept 30th- Protests, DC Motors

Discussion of Confederate flag issue and student meeting; tension in the school. School should be a neutral zone.

Students are better connected than the teachers via social media.

Next- Solar and the economics of solar. Next week- solar chimney challenge.

How do brushless DC motors work?-See http://electronics.howstuffworks.com/brushless-motor.htm--
permanent magnets are on rotor, stator fields controlled electronically:

Related to Stepper Motors:

Windmill challenge--see Kidwind Curriculum Material
 http://www.kidwind.org/windwise-1 

Experimented with DC Motors- connecting a load makes them harder to turn.

Lego RCX motors very efficient generators.