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Series-Parallel Circuits - Technical MCQs

Q1:

In a series–parallel circuit consisting of R1 and R2 in series and connected in parallel with R3, if R1 opens, then R2's voltage will:

A increase

B decrease

C remain the same

D cannot tell

ANS:B - decrease


If we take r1=2, r2=3 & r3=4.

Then,

r1+r2 = 5 //With r3 find value total resistance.

RT = 2.22.

Image current flow is 1 amp.

Then voltage is V = ir = 1*2.22 = 2.22 v.

If r1 is open, then find voltage r2/r3 = 1.714.

Current is 1 amp.

So V = IR 1.714*1 = 1.741 v.

Voltage decrease B is correct.