scalar quantity equal to the time derivative of the line integral of the magnetic vector potential along a closed path C in which charge carriers can be displaced
where A is the magnetic vector potential at a point of the path C, dr is a vector line element of C, B is the magnetic flux density at a point on a surface S delimited by the curve C, endA is a vector surface element of S, Ψ is the total flux through this surface, and t is time
Note 1 to entry: The loop voltage is often wrongly denoted as the induced voltage; this is only true when no current is flowing through the path C.
Note 2 to entry: The coherent SI unit of the loop voltage is volt, V = s−3 m2 kg A−1.
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