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I have searched online for an explanation of these terms and was unable to find a clear enough one. Request you to explain with reference to the images below:

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Thanks

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closed as too broad by Leon Heller, Finbarr, TonyM, Sparky256, RoyC Mar 4 '18 at 9:30

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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    \$\begingroup\$ Any decent electrical textbook, and many sources on the web... \$\endgroup\$ – Solar Mike Mar 3 '18 at 18:10
  • \$\begingroup\$ Welcome to EE.SE. It would take a book to explain all the details, so the up-front answer is to read books on 3-phase, plus what is on the web. @Andyaka has a good summary below in his answer. \$\endgroup\$ – Sparky256 Mar 3 '18 at 20:38
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  • Phase voltage is between A and N (or B/C and N). Also a to N or b/c to N.
  • Line voltage is between any two of the three feed lines (ignoring N if present)
  • Line current flows down any line between source and load (ignoring N if present)
  • Phase current is the current in any load element whether star or delta
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