Characteristics of resistance:-
Similar amount of current passed by each resistance i.e. I = I1 = I2 = I3 = I4 ........
The sum of potential difference across individual resistors is equivalent to the total voltage of the battery. i.e. V = V1 = V2 = V3 = V4
+....
The equivalent resistance (Re) of the series circuit can be getting by adding all the resistance of the series. i.e. Re = R1 + R2 + R3 + ........