The total power in both series and parallel circuits is computed with the formula: PT = P1 + P2 + P3 +...Pn. Why can this formula be used for both series and parallel circuits?

The total power in both series and parallel circuits is  computed with the formula: PT = P1 + P2 + P3 +...Pn. Why can  this formula be used for both series and parallel circuits?
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Answer :

In both cases all the power used in the circuit must come from  the source.
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