Q: Calculate the value I1 in given circuit.
Solution:
We need to calculate the value of current I1
At node 1
(V1/12k) + (V1/6k) + (V1/4k) - (6/6k) = 2 mA
((1/12k) + (1/6k))V1 + (1/4k) - (6/6k) = 2 mA
(V1/2k) - (1/1k) = 2 x 10-3
V1 - 2 = 4
V1 = 6volts
Now from the equation
I1 =V1/4k
= 6/4k // from above V1=6V
= 1.5 mA