resonant circuit

Scientific  

/ rĕz′ə-nənt /

1. An electric circuit which has very low impedance at a certain frequency. Resonant circuits are often built using an inductor, such as a coil, connected in parallel to a capacitor. The response of the circuit to signals of different frequencies is a function of the inductance and capacitance of the circuit and peaks at one frequency value, at which the current flow resonates most strongly with the input signal. Resonant circuits are used in radio and television tuners to pick out broadcast signals of specific frequencies.

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Example Sentences

When phones and laptops are placed on an eCoupled surface, the power transmitter in the work-surface detects the resonant circuit in the device’s receiver, which then tells the transmitter how much power to send.

From Economist