Basic DC Theory BASIC DC CIRCUIT CALCULATIONSFigure 19 Voltage Drops in a Series CircuitOhm’s law may now be applied to the entire series circuit or to individual component parts ofthe circuit. When used on individual component parts, the voltage across that part is equal tothe current times the resistance of that part. For the circuit shown in Figure 20, the voltage canbe determined as shown below.V_{1} = IR_{1}V_{2} = IR_{2}V_{3} = IR_{3}V_{T} = V_{1} + V_{2} + V_{3}V_{T} = 10 volts + 24 volts + 36 voltsV_{T} = 70 voltsRev. 0 Page 25 ES-02