the total resistance of electric circuit when resistors wired in a series is the sum of the individual resistance: each resistor in a series circuit has the same amount of current through and through it. Each resistor in a parallel circuit the same for voltage of the source applied to it.
when resistors are connected in parallel, the supply current is equal to the sum of the currents the metre resistor. In other words the currents in the branches of a parallel circuit add up to the supply current. When resistors are connected in parallel, they have the same potential difference is across them