The red, green and blue coloured switches, Physics

A board with a number of  green, blue and  red coloured  switches  is normally seen  near  the entrance of each house . What is the purpose of this board? What is the difference  among the red, green  and blue  coloured switches ? How do they work?

Posted Date: 3/18/2013 7:42:27 AM | Location : United States

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