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{{term|term= '''[[Receiver (radio)]]'''}}{{defn|defn=The apparatus that takes radio-frequency currents induced in an antenna and turns them into useful signals.}}
{{term|term= '''[[Rechargeable battery]]'''}}{{defn|defn=A secondary battery; a battery that can have a useful portion of its capacity restored by connection to a supply of electric current.}}
{{term|term= '''[[Reciprocity (electrical networks)]]'''}}{{defn|defn=A theorem that states that the current injected into one point in a network will produce a voltage at a second point that is identical to the voltage produced at the first point by injection of the same current at the first point}}
{{term|term= '''[[Reciprocity (electromagnetism)]]'''}}{{defn|defn=An observation that electric currents and electric fields can be analyzed from either point of view as regards the source of the energy in the system; for example, in radio, a good transmitting antenna is generally also a good receiving antenna.}}
{{term|term= '''[[Record player]]'''}}{{defn|defn=A phonograph; a device that turns the variations in a disk or cylinder recording groove into sound.}}
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