Problem 2.19 Fundamental of Electric Circuits (Alexander - Sadiku)

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From the circuit in Fig. 2.83, find I, the power dissipated by the resistor, and the power supplied by each source.

Alexander Sadiku 5th Ed: Fundamental of Electric Circuits Chapter 5:
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kenapa di perkalian P1, P2, P3, dan P4 "i" nya tidak diminuskan?

ikhwanrafiqi
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Why I 2 amp, we find =-2 amp, so why plus sign?

NurHossain_
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Why only absolute values for power? Can’t power be negative?isnt p4=vi= 10* -2= -20?

aziza