My brother has a little blue creature that glows, and you charge it by placing it on the little charging dock. I always wondered how this worked, since there are no plugs or contacts that connect the charging platform to the light. Now I know that it works through inducted current! The dock probably uses some kind of solenoid and the current from the outlet that it's plugged into to make a magnetic field. The outlet is 120 volts, and the potential difference in the charger itself is probably different, so this means that there are probably two solenoids forming a transformer. The magnetic field formed by the current flowing through the wires in the charger affects the circuit in the light itself and causes it to have a current flowing through it. Since the light charges, though, and doesn't go off as soon as it leaves the charger, some kind of capacitor or rechargable battery must also be part of the circuit so that it can store the charge for later use.
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