Series-Parallel Circuits - Technical MCQs

Q1:

If the voltage between points A and B equals 9 V in the given circuit, then VR3 equals ______.

A 0.9 V

B 8.1 V

C 9 V

D More information is needed to find VR3.

ANS:B - 8.1 V

Total resistance is 90(parallel)+10(both are in series) = 100.
From this total current is 9/100 = 0.09.

Voltage drop across 10 ohm is 10*0.09 = 0.9.
Voltage after 10 ohm is 9-0.9 = 8.1v.