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 Superposition Theorem (1)
 
 It states that the voltage across (or current through) an element in a linear
 circuit is the algebraic sum of the voltage across (or currents
 through) that
 element due to EACH independent source acting
 alone.
 The principle
 of superposition helps us to analyze a linear circuit with more than one independent source by calculating the
 contribution of each independent source separately.