Two resistors of 15 and 30 Ω are connected in parallel. If the combination is connected in series with a 9.0-V battery and a 20-Ω resistor, what is the current through the 15-Ω resistor?
A)0.10 A
B)0.13 A
C)0.20 A
D)0.26 A
E)0.32 A

Question

Quizplus · Accepted Answer

The equivalent resistance of the parallel resistors is 10 Ω. Adding the 20 Ω resistor in series gives a total resistance of 30 Ω. Using Ohm's law (V = IR), the total current is 0.3 A. The current through the 15 Ω resistor is 0.2 A, as it is inversely proportional to its resistance in the parallel circuit.

Two Resistors of 15 and 30 Ω Are Connected in Parallel