A system for providing electrical energy to an implanted device or to a device attached to a body. The system includes one or more permanent magnets attached to or implanted in a first body part and one or more inductor(s) attached to or implanted in a second body part. The inductor(s) are electrically couplable to the implanted device for providing the implanted device with electrical currents flowing in the one or more inductor(s) in response to changes in the position and/or orientation of the permanent magnet(s) relative to the position and/or orientation of the inductor(s). The system may include a current rectifier for rectifying electrical currents provided by the inductor(s). The system may also include a charge storage device electrically coupled to the current rectifier for storing electrical energy received from the current rectifier.