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Series Circuits - Technical MCQs

Q1:

If five equal resistors are connected in series with a 20 V source, and a current of 400 µA is measured, each resistor equals ___.

A 10 komega.gif

B 50 komega.gif

C 125 omega.gif

D 20 omega.gif

ANS:A - 10 komega.gif

R = 5R.
V= 20V.
I = 400*10^-6A.

SO WE KNOW THAT V = IR.
SO, 20 = 400*10^-6*5R.

So we will get it as R=10000.
That is, R = 10kohms.