2. Kirchhoff's Mesh Law or Voltage Law
(KVL)
In any electrical network, the algebraic sum of the products of currents and resistances in each
of the conductors in any closed path (or mesh) in a network plus the algebraic sum of the
e.m.f.’s.
in that path
is zero
.
That is, ∑
IR
+ ∑
e.m.f
= 0 round a mesh
It should be noted that algebraic sum is the sum which takes into account the polarities of the
voltage drops.
That is, if we start from a particular junction and go round the mesh till we come back to the
starting point, then we must be at the same potential with which we started.
Hence, it means that all the sources of emf met on the way must necessarily
be equal to the
voltage drops in the resistances, every voltage being given its proper sign, plus or minus.
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