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Parallel Circuits - Technical MCQs

Q1:

What does RT equal in the given circuit?

A 90 omega.gif

B 180 omega.gif

C 200 omega.gif

D 1.8 komega.gif

ANS:A - 90 omega.gif

r = v/I.
r1 = 9/50m = 180ohm.
r2 = 9/45m = 200ohm.
r3 = 1.8kohm.

1/Rt = 1/r1 + 1/r2 + 1/r3 = 90ohm.