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2014-08-16T02:19:11+05:30

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Voltage drop across 6 ohms = 6 ohms * 5 amp = 30 volts
Current in 12 ohm resistor = voltage drop / resistance
         = 30 / 12 = 2.5 amp

By applying kirchoff's current law :
       current in 8 ohms resistor = 5 amp + 2.5 amp = 7.5 amp

Power dissipated = i*i* R =>
       =    7.5 * 7.5 * 8  +  5 * 5 * 6  + 2.5 * 2.5 * 12
       =   675 watts


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