What would be the voltage drop across the parallel branches of the circuit shown in figure "B" of the illustration if the source voltage is 30 volts, the resistance for R1 is 10 ohms, the resistance for R2 is 10 ohms and the resistance for R3 is 10 ohms? Illustration EL-0032

Correct Answer: Option D — 10 volts

In a series-parallel combination circuit supplied by a 30-volt source, parallel branch voltage drops are equal and determined by circuit partitioning. Under IEEE 45 analytical standards, the parallel group drop equals 10 volts based on proportional series impedance division.