The assertion (A) is true. Electrons flow from lower potential to higher potential in a conductor because they are negatively charged and are attracted by the positive terminal of the battery or power source. The electric field is always directed from higher potential to lower potential, but electrons move in the opposite direction because of their negative charge.The reason (R) is also true. A dry cell is a type of battery that converts chemical energy into electrical energy by a spontaneous electrochemical reaction. It maintains an electric potential difference across the ends of a conductor by transferring electrons from the negative terminal (anode) to the positive terminal (cathode) through an external circuit. The potential difference is the driving force for the electric current in the circuit.