Question

It's a simple circuit analysis with actually a few questions. But i'm confused of some basic circuit principals and concepts. I hope you can explian it in detail... Thx a million!

R2 10 k2 RA Ri 40 kn 20 kn R3 = 20 kSN 5 V

(1) why i3 is going this way? i usually see in this kind of graph i3 usually go to the negative side of the battery. Is this graph's direction prescribed?

So in this graph, the battery is supplying power (left circuit) and absorbing power (right circuit) at the same time? Do all kinds of battery have ability to do this?

(2) could you please label all the current and voltage in this graph? (do we need to choose a ground to analyze?)

(3)Find the power supplied by the battery pack. (Make sure your sign convention is correct.

(what's the "power" mean in this question. P=IV or V^2/R when consider resistors, but battery has (nearly )no resistance. As for batteries..."power" means "voltage"?)

Now you add a 3V battery to the circuit R2 = 10 kN 40 k 5 V R3 20 kn R4 20 k2 3 V

(4) Does the 3V battery supply or absorb power? Explain using calculations and noting sign conventions.

(are there any, somehow common solutions for this kind of problem?(determine a newly added/unknown device is supplying/absorbing power)

or what's the most important thing/ the correct sequence when considering this kind of problem)

Thank you again!

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