In electric circuits, you know how parallel voltage is the same throughout, but series voltage adds up to the supply. What if there is a battery connected in series to two resistors. However, what if one of the resistors continues on parallel. How, then would u find the volts of the solo one in series. Also, what part does an open circuit play in a parallel circuit. In other words, if the first two resistors connected parallel are closed, but the third is open, what is the result?