About: http://webisa.webdatacommons.org/439368410

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Sometimes com is ground and other times it isn't. klrogers answered the question - answer lies on the rectification process - full-wave rectification and half-wave rectification.
http://www.w3.org/ns/prov#wasQuotedFrom	hvac-talk.com