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Series-Parallel Circuits - Technical MCQs

Q1:

If a series–parallel circuit has all 30-ohm resistors, what is the total resistance when R1 is in series with a parallel circuit consisting of R2 and R3?

A 10 ohms

B 20 ohms

C 45 ohms

D 90 ohms

ANS:C - 45 ohms

R2 & R3 parallel then equavelent resistance R2*R3/R2+R3=15 ohm.

This is parallel with R1 then total resistance (R)=(R1+15) ohm
R1=30
R=(30+15)ohm
R=45 ohm