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Parallel Circuits - Technical MCQs

Q1:

What is the total power loss if 2 k and 1 k parallel-connected resistors have an IT of 3 mA?

A 6 W

B 36 W

C 6 mW

D 36 mW

ANS:C - 6 mW

Power=Voltage * Current. Voltage= Current * Resistance, Resistors in parallel (1/R=1/R1+1/R2) OR (R=R1*R2/R1+R2), so, 1/R= 1/2+1/1 = 3/2KOhm , R= 2/3 KOhm, P=V*I = (I*R)* I. P= I*I*R, P=3*3*2/3, P=9*2/3, P=18/3, P=6mW.