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User avatar #156 - Lambda (02/25/2013) [-]
This works on exactly the same principal as an AM radio. You have this electromagnetic energy propagating through space. Build an LC circuit to the correct specifications and it will "ring", or resonate, in the presence of this energy. Use diodes to rectify it to DC and you have a very small usable current. In a crystal radio, that small current is used to drive an earphone, in an electric radio it is used to drive the input stage of an amplifier.
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