A series ohmmeter circuit uses a 3 V battery and a 1 mA meter movement. What is the half-scale resistance for this movement?
A. 3 kΩ
B. 4 kΩ
C. 5 kΩ
D. 6 kΩ
Answer: Option A
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Common mode rejection ratio is defined as ratio of
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V= 3v
I =1x10^(-3)
R = V / I
R = 3 / 1x10^-3
R = 3k ohm