a moving coil that drives the diaphragm of a sound reproduction system, as a loudspeaker, by the interaction of a changing magnetic field that is produced by a current in the coil and a fixed magnetic field that is produced by permanent magnets.
How Do You Change Passive Voice Into Active Voice?In active voice, the subject performs the action of the verb. In passive voice, the subject receives the action of the verb. If you feel like you need a little more than that, keep reading.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019