일반물리학 2 — Circuits: Problem 33

33 In Fig. 27-39, circuit section AB absorbs energy at a rate of 50 W when current i = 2.0 A through it is in the indicated direction. Resistance R = 2.0 Ω. (a) What is the potential difference between A and B? Emf device X lacks internal resistance. (b) What is its emf? (c) Is point B connected to the positive terminal of X or to the negative terminal?