Resistances in Series

Definition :-    

    Imagine two or more resistors in series, i.e. connected one after another so that the same current flows through them. The total resistance of the collection is the sum of individual resistances. 

    Suppose a current i flows through the resistances. The potential difference V between the points P and Q is the sum of voltage differences across the sequence of resistors, i.e., i( R1 +  R2  +  R3  +.............+ Rn ), and the current flowing is i, so that the resistance is

( V / i )    =   R    =   R1  +  R2   +  R3  +  ..............   +  Rn  .......................(1)

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This is the well known formula for the total resistance of n resistors in series.          

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