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Parallel Circuits - Technical MCQs

Q1:

What is RT for a 12 k, a 4 k, and a 3 k resistor in parallel?

A 1.5 k

B 2 k

C 6.3 k

D 19 k

ANS:A - 1.5 k

In case of parallel circuits resistance can be calculated using
1/RT=1/R1+1/R2+1/R3
from this,
we get
1/RT=1/12+1/4+1/3=2/3
RT=3/2k
=1.5k