I have read from some book that: "The voltage quantity symbol V sometimes has subscripts to designate the two points to which the voltage corresponds. If the letter a designates one point and b the other, and if W joules of work are required to move Q coulombs from point b to a then, \$V_{ab}=\frac{W}{Q}\$. Note that the first subscript is the point to which the charge is moved"
While Wikipedia (http://en.wikipedia.org/wiki/Double_subscript_notation) says: "\$V_{CB}\$ means the "\$V\$" from \$C\$ to \$B\$."
Can you help me with the true meaning of the first subscript?
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