Dynamic loudspeakers convert current into motion via a coil driving a magnetized cone

Evidence

The most common form of loudspeaker uses a wire coil with a movable magnet inside the coil tube. The magnet is connected to a lightweight (usually paper) cone attached at its outer edges to a frame. Electrical current passing through the coil creates a variable magnetic field that in turn causes a varying force on the permanent magnet, moving the magnet and with it the speaker cone. — Eric J. Heller, Why You Hear What You Hear- An…, 470

Categorization

• DEFINE: Explains the operating mechanism of the most common loudspeaker type.