firestreak7 Posted April 23, 2013 Share Posted April 23, 2013 I am sure you have seen the flashlights that you shake to charge. I know they function by building a charge off of a magnet moving through a magnetic coil. I was wondering what the formula for the amount of electricity generated by this for every up and down (as one unit)? Also, what is a good ball park on force it takes to pass the magnet through the coil and what is an easy/typical base variable(s) to start from? (such as, # of coils = 100 vs 57) Link to comment Share on other sites More sharing options...
swansont Posted April 24, 2013 Share Posted April 24, 2013 The basic concept is Faraday's law of induction, that you will induce a voltage that is proportional to how fast the magnetic flux is changing; the latter is dependent on the strength of the magnet and how fast you shake it. The current will then depend on the resistance of the circuit. http://hyperphysics.phy-astr.gsu.edu/hbase/electric/farlaw.html Link to comment Share on other sites More sharing options...
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