Kirchoff's law?help!!1?

Question

While analyzing a circuit,using Kirchhoff's law I am confused with the sign given across a resistor.

How do we put those sign across the resistors so that we get equation in relation with kirchhoff's voltage law??

Answer 1

It depends if you are measuring a clockwise current path or a counter-clockwise current path.

For a current path that begins at the plus (+) end of the voltage source, the first end of a resistor you come to is labelled with a plus (+) and the other end is labelled with a minus (-). The same is true for other resistors you encounter following the path of current.

For a current path that begins at the minus (-) end of the voltage source, the first end of a resistor you come to is labelled with a minus (-) and the other end is labelled with a plus (+).

Answer 2

KVL or the mesh rule is actually pretty simple. There is no set sign way. Basically you define the sign. So if you choose from - to + to be positive, then from + to - would be negative. You add up each "side" of the mesh and the sum should be zero.