Question

find the power dissipated​

Answer 1

Answer

power dissipated= voltage^2 / total resistance

Explanation

total circuit resistance is pretty complicated:

excluding units for simplicity:

4+4+2=10 (RHS series connection)

(10*10)/(10+10)=5 (10 ohm resistor in middle and RHS combination's total resistance) (they are parallel)

5+2+3=10 (total resistance of the two combinations on the r8)

(10*10)/(10+10)=5 (once again, to find total resistance of all except the top left 5 ohm resistor)

finally, total circuit resistance = 5+5=10

so power dissipated is (20V^2)/10 ohm = 40 W