The circuit shown in Fig. contains two batteries, each with an emf and an internal resistance, and

Question:

The circuit shown in Fig. contains two batteries, each with an emf and an internal resistance, and two resistors. Find
(a) The current in the circuit (magnitude and direction);
(b) The terminal voltage Vab of the 16.0-V battery;
(c) The potential difference Voc of point a with respect to point c.
(d) Using Fig. as a model, graph the potential rises and drops in this circuit.