http://www.youtube.com/watch?v=wIwMe-5LIp8&feature=player_detailpage Sistema de posada a terra 1
http://www.youtube.com/watch?v=DQVyoVp9xlk&feature=player_detailpage Sistema de posada a terra 2
http://www.youtube.com/watch?v=fd74-NUpMIc&feature=player_detailpage Sistemes de posada a terra
http://www.youtube.com/watch?v=oJF4oXFDO3Y&feature=player_detailpage Ós enrampant-se
Màquines elèctriques, fonaments elèctrics i magnètics
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