Practice portal › Current Electricity › Kirchhoff's Laws and Circuit Analysis
Asked in GSEB Board July 2022 · Kirchhoff's laws in networks
Given (figure): starting from A there is a cell of emf V with its + plate toward A, then a resistor R, then B; the current I flows from B toward A.
Idea: walk from A to B adding up the potential changes.
Across the cell, from + to -: the potential falls by V.
Across the resistor, against the current: the potential rises by IR, because current flows from higher to lower potential.
V_A - V + IR = V_B, so V_B - V_A = IR - V.
So V_B - V_A = IR - V.
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