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Introductory Physics Homework Help
Determining voltage across resistor and current direction
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[QUOTE="NascentOxygen, post: 4977181, member: 336970"] The resistor is a passive element, it does not source current. So we know the current through the resistor is coming out of the network, and it's 1.17A. So, 1.17A out of the network can be expressed as negative current INTO the network. The question asks for the current entering the network from the resistor, this must therefore be negative 1.17A, i.e., -1.17A. It's just the way it's done to stay mathematically correct at all times. Power is I[SUP]2[/SUP].R so any negative sign disappears in the power calculation. [/QUOTE]
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Introductory Physics Homework Help
Determining voltage across resistor and current direction
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