Step 1
The power Pvs can be found by finding Vs and Is, by finding the impedance across Vs and applying ohm's law we can find the voltage Vs and by applying KCL we can find the current Is
Step 2
From the figure, we can find the I by adding the two current that is leaving the junction according to KCL
I=25 mA+10 mA=32 mA
To find Vs
We need to find the resistance across the voltage source Vs, by open the circuit at Vs we can find the resistance across it. We can apply the delta to star transformation
we can redraw the circuit as
The 2/3 Kohms and 4 Kohms are in series
The 4/9 Kohms and 333 ohms are in series
Here
The 4.6 Kohms and 0.77 Kohms are in parallel
and this Z is series with 1/3 k ohms
Therefore
The power dissipated from the source is