The circuit shown in Fig. E25.30 contains two batteries, each with an emf and an interna...

The circuit shown in Fig. E25.30 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 V_ab of the 16.0-V battery; (c) the potential difference V_ac of point a with respect to point c . (d) Using Fig. 25.20 as a model, graph the potential rises and drops in this circuit.