Kirchhoff’s laws state
Current Law At any junction in an electric circuit the total current flowing towards that junction is equal to the total current flowing away from the junction
(b) Voltage Law
In any closed loop in a network, the algebraic sum of the voltage drops (i.e. products of current and resistance) taken around the loop is equal to the resultant e.m.f. acting in that loop Thus, referring to Figure E1 - E2 = IR1 + IR2 +IR3
The superposition theorem
In any network made up of linear resistances and containing more than one source of e.m.f., the resultant current flowing in any branch is the algebraic sum of the currents that would flow in that branch if each source was considered separately, all other sources being replaced at that time by their respective internal resistances
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