How does the telephone work? Does it use electricity? Yes it does! Then why does it works still when electricty goes in you area? Answer me this first, energy can not be created or destroyed but can be converted to one form to another...by the law of conservation of energy, what energy a telephone uses then? Imagine having electricty when electricity has gone, hmmm but the electricity in the phone outlet is small but there are ways to magnify electricity by the use of transistors, resistors (it will be helpful to know colour coding) and bridge rectifier.
Another cool idea to follow up in years to come.
Watch this video found on the popular website "You Tube"....
http://www.youtube.com/watch?v=WoaLGvJkoP8
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