81-4 Resistance and Source combination The series combination of resistors R R R 十 R R.=R,+R,+…+R The series combination of voltage sources: Several voltage sources in series may be replaced by an equivalent voltage source having a voltage equal to the algebraic sum of the individual sources qThe series combination of resistors: §1-4 Resistance and Source combination . Several voltage sources in series may be replaced by an equivalent voltage source having a voltage equal to the algebraic sum of the individual sources. The series combination of voltage sources: eq =1 + 2 ++ N Req = R1 + R2 ++ RN − +  s i R1 R2 RN − +  s Req i