일반물리학 2 — Circuits: Problem 20

20 In Fig. 27-31, \(\mathcal{E}_1 = 8.00\text{ V}\), \(\mathcal{E}_2 = 12.0\text{ V}\), \(R_1 = 100\text{ }\Omega\), \(R_2 = 200\text{ }\Omega\), and \(R_3 = 300\text{ }\Omega\). One point of the circuit is grounded (\(V = 0\)). What are the (a) size and (b) direction (up or down) of the current through resistance 1, the (c) size and (d) direction (left or right) of the current through resistance 2, and the (e) size and (f) direction (left or right) of the current through resistance 3? (g) What is the electric potential at point A?