Kirchhoffs Law – Find the unknown voltage V1 in the circuit of

Initially, one may not be clear regarding the solution of this question. One may think of Kirchhoff’s laws or mesh analysis etc. But a little thought will show that the question can be solved by the simple application of Kirchhoff’s voltage law. Taking the outer closed loop ABCDEFA and applying Kirchhoff’s Voltage laws to it, we get

− 16 × 3 − 4 × 2 + 40 − V₁= 0 ;

∴ V₁ = − 16 V