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Are sums of components? powers equal to zero? Why?

Are sums of components? powers equal to zero? Why?

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Answer #1

I assume that you are asking this in the context of the Electrical circuits. In the Electrical circuit, the sum of the component's power is zero or in other words, we can say that the power generated is equal to the power absorbed. In the Electrical circuit there is a theorem called Tellegen's Theorem which proves that the generated power is equal to the absorbed power.

For simplicity Let us take a simple circuit

Current in the circuit

The power generated by 12V voltage source  

Power absorbed by one resistor

Power absorbed by all three resistor

We can see that

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