These piezoelectric crystals are used in some radio earphones to change electrical energy to mechanical energy and in phonograph pickups to change mechanical energy to electrical energy.
(These piezoelectric crystals; are used; L:in some radio earphones; to change electrical energy to mechanical energy and in phonograph pickups to change mechanical energy to electrical energy)
These piezoelectric crystals
are used
L:in some radio earphones to change electrical energy to mechanical energy and in phonograph pickups to change mechanical energy to electrical energy