It seems to me that they're the same thing, the potential between points 1 and 2.rattus said:Does anyone have a reference which defines the meaning of double subscripts?
That is, does "V12" mean "voltage at 1 with respect to 2", or does it mean "voltage rise from 1 to 2"?
bphgravity said:I have no idea what you guys are talking about. Anyone care to give a basic explanation?
Not at all authoritative. As a matter of maintaining purity of heart and cleanliness of body, I refuse to read anything on the wikipedia web site, and I decline to follow any links that lead to that site.Smart $ said:
charlie b said:I pulled my copy of Stevenson off the shelf, and confirmed Kingpb's statement. It's a bit disconcerting that we both have the Fourth Edition. Mine shows a copyright date of 1982. :shock:
rattus said:Swapping leads on a phasemeter would introduce a 180 degree phase shift.
QUOTE]
Are you implying that DC has phase? /boggle (I just had to........)
I look to the night heavens and see no relevance.charlie ("purer and cleaner than thou") b.
Given the above...kingpb said:According to Elements of Power System Analysis, Fourth Edition, by William D Stevenson, Jr., the double subscript notation was devloped to replace the need for polrity marks for voltage, and direction arrows for current.
For current, the notation defines the direction of flow of current when the current is considered to be positive. For example, Iab would mean the current is flowing from point a to point b. Iab = -Iba.
For voltage, the double subscript denotes the nodes of the circuit between which voltage exists. As stated earlier, the convention is that the first subscript denotes the voltage of that node with respect to the node identified by the second subscript. Vab would be the voltage at node a with respect to voltage at node b, and that Vab is positive. Vab = Vba @ 180 deg = -Vab
Using Kirchhoff's voltage law, the order of the subscripts is the order of tracing a closed path around the circuit.