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Ohm''s Law - Engineering

Q1:

How much resistance is needed to draw 17.6 mA from a 12 volt source?

A 212 

B 6.8 k

C 68 

D 680 

ANS:D - 680 

Simple Trick:

R : V/I.
R : 12/17.6 * 10^-3.
R : 12 * 10^3/17.6.
R : 12000/17.6.
R : 120000/176.
R : 681 OHM.