In this video you can understand how electrons from the body or from any substance are reacting under curent excitation. Both case are study: under DC and AC.The same principe is working in condensator or capasitor.
Polarisation FR.avi
http://www.youtube.com/watch?v=jy0rq1QrZC0
Polarisation EN.avi
http://www.youtube.com/watch?v=sG8bzfeSRU8
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