The power absorbed by the unknown element X in the circuit

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The power absorbed by the unknown element X in the circuit shown below is—

1. 25W
2. 10W
3. 15W
4. None of these

Correct Option: B

The given circuit

Voltage drop across 60Ω resistance = 0·5 × 60 = 30V
So, the voltage drop across unknown element
X = 50V – 30V = 20V
Now, power absorbed by unknown element,
X = 20 × 0·5 = 10W.