Matches in DBpedia 2015-10 for { <http://dbpedia.org/resource/Post_Office_Box_(electricity)> ?p ?o }
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- Post_Office_Box_(electricity) abstract "The Post Office Box was a Wheatstone bridge style testing device with pegs and spring arms to close electrical circuits and measure properties of the circuit under test.The boxes were used in the United Kingdom by engineers from the then General Post Office, who were responsible for UK telecommunications to trace electrical faults, i.e. to determine where a break occurred in a cable which could be several miles in length. It works on the principle of Wheatstone bridge to identify the resistance of wire connected and then by using wire resistivity and cross section calculating length of wire and thus determining where the cable had broken.Post Office Boxes also were common pieces of scientific apparatus in the UK O-Level and A-Level schools public examination Physics syllabus in the 1960s.The working of P.O. Box is also a part of the IIT-JEE examination syllabus .A typical Post Office Box is in a wooden box with a hinged lid and a metal or bakelite panel showing circuit connections. Coils of wire are wound non-inductively, mounted in the body of the box, and have a negligible temperature co-efficient.Pairs of ratio arms are each 10, 100, 1000 ohms. Resistance arms contains a number of coils from 1 to 5000 ohms with a plug for infinite resistance.".
- Post_Office_Box_(electricity) wikiPageID "21324929".
- Post_Office_Box_(electricity) wikiPageLength "1815".
- Post_Office_Box_(electricity) wikiPageOutDegree "12".
- Post_Office_Box_(electricity) wikiPageRevisionID "659818962".
- Post_Office_Box_(electricity) wikiPageWikiLink A-level.
- Post_Office_Box_(electricity) wikiPageWikiLink Advanced_Level_in_the_United_Kingdom.
- Post_Office_Box_(electricity) wikiPageWikiLink Bakelite.
- Post_Office_Box_(electricity) wikiPageWikiLink Category:Electrical_meters.
- Post_Office_Box_(electricity) wikiPageWikiLink Category:Electronic_test_equipment.
- Post_Office_Box_(electricity) wikiPageWikiLink Category:Historical_scientific_instruments.
- Post_Office_Box_(electricity) wikiPageWikiLink Category:Scientific_instruments.
- Post_Office_Box_(electricity) wikiPageWikiLink GCE_Ordinary_Level.
- Post_Office_Box_(electricity) wikiPageWikiLink General_Post_Office.
- Post_Office_Box_(electricity) wikiPageWikiLink O-Level.
- Post_Office_Box_(electricity) wikiPageWikiLink Ohm.
- Post_Office_Box_(electricity) wikiPageWikiLink Physics.
- Post_Office_Box_(electricity) wikiPageWikiLink United_Kingdom.
- Post_Office_Box_(electricity) wikiPageWikiLink Wheatstone_bridge.
- Post_Office_Box_(electricity) wikiPageWikiLinkText "Post Office Box (electricity)".
- Post_Office_Box_(electricity) wikiPageWikiLinkText "Post Office Box".
- Post_Office_Box_(electricity) hasPhotoCollection Post_Office_Box_(electricity).
- Post_Office_Box_(electricity) wikiPageUsesTemplate Template:Measurement-stub.
- Post_Office_Box_(electricity) wikiPageUsesTemplate Template:Portal.
- Post_Office_Box_(electricity) wikiPageUsesTemplate Template:Reflist.
- Post_Office_Box_(electricity) subject Category:Electrical_meters.
- Post_Office_Box_(electricity) subject Category:Electronic_test_equipment.
- Post_Office_Box_(electricity) subject Category:Historical_scientific_instruments.
- Post_Office_Box_(electricity) subject Category:Scientific_instruments.
- Post_Office_Box_(electricity) hypernym Device.
- Post_Office_Box_(electricity) type Device.
- Post_Office_Box_(electricity) comment "The Post Office Box was a Wheatstone bridge style testing device with pegs and spring arms to close electrical circuits and measure properties of the circuit under test.The boxes were used in the United Kingdom by engineers from the then General Post Office, who were responsible for UK telecommunications to trace electrical faults, i.e. to determine where a break occurred in a cable which could be several miles in length.".
- Post_Office_Box_(electricity) label "Post Office Box (electricity)".
- Post_Office_Box_(electricity) sameAs पोस्ट_आफिस_बॉक्स_(विद्युत).
- Post_Office_Box_(electricity) sameAs m.05f6w4n.
- Post_Office_Box_(electricity) sameAs Q7233679.
- Post_Office_Box_(electricity) sameAs Q7233679.
- Post_Office_Box_(electricity) wasDerivedFrom Post_Office_Box_(electricity)?oldid=659818962.
- Post_Office_Box_(electricity) isPrimaryTopicOf Post_Office_Box_(electricity).