Assertion: spark plug's center electrode | /r/CapableOf | designate groundelectrode
Facets:
Source sentences:
text: The center electrode protrudes through the porcelain insulator into the combustion chamber, forming one or more spark gaps between the inner end of the central electrode and usually one or more protuberances or structures attached to the inner end of the threaded shell, designated the "side", or "ground" electrode.