Chapter 27, Problem 100P

In Fig. 27-81, the ideal batteries have emfs ℰ₁ = 20.0 V, ℰ₂ = 10.0 V, ℰ₃ = 5.00 V, and ℰ₄ = 5.00 V, and the resistances are each 2.00 Ω. What are the (a) size and (b) direction (left or right) or current i₁ and the (c) size and (d) direction of current i₂? (This can be answered with only mental calculation.) (e) At rate is energy being transferred in battery 4, and (f) is the energy being supplied or absorbed by the battery?

Figure 27-81 Problem 100.