Kirchhoffs Voltage Law or KVL, states that “in any closed loop network, the directional sum of the voltage drops in various components in the loop is equal to the directional sum of the e.m.f.’s of the voltage source in the same network”. In other words the algebraic sum of all voltages within the loop must be equal to zero. This idea by Kirchhoff is known as the Conservation of Energy.
Starting at any point in the loop continue in the same direction noting the direction of all the voltage drops, either positive or negative, and returning back to the same starting point. It is important to maintain the same direction either clockwise or anti-clockwise or the final voltage sum will not be equal to zero. We can use Kirchhoff’s voltage law when analyzing series circuits.
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