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First of all find the resistance of the individual resistor which is 38.4
First is open close close so
No current as the first switch is open so no power
then Close Close open
Current passes but as Switch two is open so Current bypasse the resistor B so the resistance is not taken into account of B see because the current has an easier route so we say it is a short circuit so when we take the effective resistance it wiill only be 38.4 as Switch 3 is openso
p=V^2/Rand we get 1500 watts
In Third Case it is Close CLOSE CLOSE
Now againn the current bypasse resistance B a short circuit occur so we take the resistance of A and C in parrallel as in the circuit.
Hope you get the idea if not please feel free to ask please
Thanks mate