About: http://webisa.webdatacommons.org/419157735

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	A tube with a negative plate acts like an OPEN CIRCUIT. No CURRENT FLOWS. Therefore, the vacuum tube is a ONE WAY CIRCUIT. It will carry current only from the cathode to the plate.
http://www.w3.org/ns/prov#wasQuotedFrom	rfcafe.com