PHYS208 Fundamentals of Physics II

Answer for Ch. 28, 48P

I labeled the currents as i1 (through emf1 and R3), i2 (through emf2 and R2), and i3 (through R1). Why did HRW not switch the labels of R1 and R3 -- it would have made a lot more sense!

Currents:
i1 421 mA to right
i2 158 mA to right
i3 263 mA down
Powers:
of R1 346 mW
of R2 50 mW
of R3 709 mW
total dissipated:  1.10 W
total provided by emf1 1.26 W
total absorbed by emf2 0.16 W

Note that since the current through emf2 is going in the opposite direction to its polarity, it is being re-charged (receiving power from emf1).


"http://www.physics.udel.edu/~watson/phys208/exercises/answers/28-48P.html"
Last updated Feb. 21, 1998.
Copyright George Watson, Univ. of Delaware, 1997.