moving-coil
/ˈmuːvɪŋˈkɔɪl/adjective
attrib.
- (of an electrical device such as a voltmeter or microphone) containing a wire coil suspended in a magnetic field, so that the coil either moves in response to a current or produces a current when it is made to move（电压表、麦克风等电气设备）动圈式的。