the bulb will get duller because the electricity is sharing its power into the 2 bulbs joined onto the circuit that is what you will find will happen well only if you do it right
Serie circuit -> current flowing through each component is the same -> total resistance over all compenents is the sum of the resistance of each individual component.Parallel circuit ->...
by adding the the resistances in series the total resistance of the circuit increses and thus the crunt flowing in the circuit decrese. Ans 2 .the current in series circuit of constant resistance...
voltage over resistance/impredance. V / I * RV= VoltageI= CurrentR= Resistance or ImpedanceCover what you want to know and the way the other two are laid out gives you your equation.