일반물리학 2 — Circuits: Problem 37

37 In Fig. 27-41, the resistances are \(R_1 = 1.0\ \Omega\) and \(R_2 = 2.0\ \Omega\), and the ideal batteries have emfs \(\mathcal{E}_1 = 2.0\ \text{V}\) and \(\mathcal{E}_2 = \mathcal{E}_3 = 4.0\ \text{V}\). What are the (a) size and (b) direction (up or down) of the current in battery 1 and the (c) size and (d) direction of the current in battery 2? (e) Is battery 1 absorbing or providing energy and (f) at what rate? (g) What is the potential difference \(V_a - V_b\)?