Common Mode Choke
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A common mode choke is an electrical component, comprised of two coils wound on a single magnetic core, that operates as a passive inductor which blocks an electrical circuit's higher-frequency AC current while passing signals of lower frequencies and DC by having a reactance-defined impedence proportional to its frequency. 
Like standard electrical chokes, common mode chokes are used as inductive components in electronic filters, having large inductance and very small resistance, and thus consuming only very low levels of electrical power. A common mode choke is more useful than
Like standard electrical chokes, common mode chokes are used as inductive components in electronic filters, having large inductance and very small resistance, and thus consuming only very low levels of electrical power. A common mode choke is more useful than