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? EL-0032

Correct Answer: Option B — 10 volts

In a series-parallel circuit configuration, the voltage drop across the entire parallel branch network equals the source voltage minus the series component drops, or can be determined via voltage divider rules. With equal 10-ohm resistors across a 30V source, the parallel block drops 10 volts.