If a resistor of 350 ohms is connected across a source of 175 volts, with a current of 0.05 amps what is the power dissipation?? It should be 87.50W right??

What if the voltage is reduced to 105 volts, what is the power being dissipated by the resistor??

The answer in the book says : 31.5W

I'm not sure how they got that answer, how do I write it out to get the answer??


Thanks !!!

 

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Thanks.

Dave