About: http://webisa.webdatacommons.org/46115931

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	Factors such as line loading and variations in telephone characteristics (i.e., resistance and capacitance) greatly affect the actual telephone line voltage, making absolute voltage sensing difficult.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com