The formula for total resistance in a series circuit is ____.
A. RT = R1 = R2 = R3 ... = Rn
B. RT = R1 + R2 + R3 ...+ Rn
C. 1/ RT = 1/R1 + 1/R2 + 1/R3 ...+ 1/Rn
D. RT = R1 - R2 - R3 ... - Rn
Answer: B
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