Barron's 2nd Edition PT1 Q49

Barron's Book

49) This question wants us to find the voltage drop through the 1 Ohm resistor. If we refer back to question 48, we can take a look at how we simplified the circuit.

Where R is resistance, and V is voltage

We can see that R[3], the 1 Ohm resistor, is 1/3 of the equivalent resistance in the circuit. This means that the voltage drop through R[3] will be 1/3 of the total voltage from the battery.

Where R is resistance, and V is voltage

Answer: A