Resistors Connected in Series and Ohm's Law. How to Find Total Resistance, Current and Voltage How to use basic ohm's law calculations for series connected resistors to find voltage (V), current (I) and resistance (R). In this video we use ohms law to calculate circuit current, total resistance and supply voltage of series connected resistors. Full examples are given to work out the total resistance of a number of series connected resistors the current flowing in the circuit and the potential di