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    Because there is only one path for electron flow:

                    The Total resistance (Rt) of a series circuit is determined by ADDING the resistances.

                    The current flow in a series circuit is equal at all points in the circuit (because there is
only one path all of the electrons must follow that path).

                    There is a VOLTAGE DROP (a loss of electrical pressure) at each load in the
circuit. The amount of the VOLTAGE DROP is dependant on the size of the RESISTANCE -
the greater the resistance, the greater the voltage drop.  You can think of this as water
flowing through a hose - the more you kink the hose - the greater the drop in pressure.  The
sum of the VOLTAGE DROPS in a circuit must always equal the source voltage - this is
known as "Kirchhoff's Voltage Law" and only applies to SERIES circuit branches.