http://www.youtube.com/watch?v=1xPjES-sHwg --> current & Voltage
http://www.youtube.com/watch?v=F1p3fgbDnkY&feature=related --> potential difference
http://www.youtube.com/watch?v=ZjwzpoCiF8A&feature=related --> Transformer
http://www.youtube.com/watch?v=F1p3fgbDnkY&feature=related --> potential difference
http://www.youtube.com/watch?v=ZjwzpoCiF8A&feature=related --> Transformer
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