Mesh current method

In this topic you will learn about electrical circuit analysis method (mesh method)
and how to put the directions of currents of electric circuit and when would more than current appears in the simulation equations and position of resistors and here a review
Steps to follow for the "Mesh Current" method of analysis:
(1) Draw mesh currents in loops of circuit, enough to account for all components.
(2) Label resistor voltage drop polarities based on assumed directions of mesh currents.
(3) Write KVL equations for each loop of the circuit, substituting the product IR for E in each resistor term of the equation. Where two mesh currents intersect through a component, express the current as the algebraic sum of those two mesh currents (i.e. I1 + I2) if the currents go in the same direction through that component. If not, express the current as the difference (i.e. I1 - I2).
(4) Solve for unknown mesh currents (simultaneous equations).
(5) If any solution is negative, then the assumed current direction is wrong!
(6) Algebraically add mesh currents to find current in components sharing multiple mesh currents.
(7) Solve for voltage drops across all resistors (E=IR).