| http://www.w3.org/ns/prov#value | - The energy receiving unit may further be configured for storing the voltage, such as by including a capacitor or chargeable battery. [0031] Thus, the power source 18 may also be a device adapted to wirelessly receive energy from an external energy source (not shown), such as, for example by receiving electromagnetic waves from an external transmitter and converting and storing electrical energy fo
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