1. Internal Resistance of a Battery A rechargeable battery with emf 52 and internal resistance r is being recharged. The charger is a power supply with emf 81 with negligible internal resistance. (a) Draw a circuit diagram for this circuit. (b) Suppose that 81 = 14.0 V, 52 = 12.0 V, and the current through the battery is 950 mA. Find the internal resistance of the battery. (c) What fraction of the energy supplied by the charger is stored in the rechargeable battery (as opposed to dissipated by the internal resistance)