The weakest parts of the chain are the devices that are used for converting the electrical energy into light or mechanical motion, and vice-versa.
(The weakest parts of the chain; are; the devices that are used for converting the electrical energy into light or mechanical motion, and vice-versa) (the devices; are used; for converting the electrical energy into light or mechanical motion, and vice-versa)
The weakest parts of the chain the devices
are are used
the devices that are used for converting the electrical energy into light or mechanical motion, and vice-versa
for converting the electrical energy into light or mechanical motion, and vice-versa