In the circuit of fig. below power is absorbed by

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In the circuit of fig. below power is absorbed by—

1. dependent source of 6 W
2. dependent source of 60 W
3. independent source of 6 W
4. independent source of 60 W

Correct Option: A

20 – 500 i_x – (– i_x) (200 + 100) = 0

or 20 = 500 i_x – 300 i_x
or 20 = 200 i_x
or i_x = .1 A
(+ve sign of ix means power is delivered by independent source and absorbed by the dependent source.)
Voltage across dependent source,
V = (200 + 100) i_x = 300 i_x = 300 × .1 = 30 V
Power absorbed by dependent source = V (2i_x) = 30 × 2 × .1 = 6 W
Alternative (A) is the correct choice.