Answer: The following should be included in your description
• Zinc is the anode, and copper is the cathode
• The lemon flesh and juice provide the salt bridge and electrolyte solution
• Electrons flow from zinc to copper through the external wires
• Electrolytes flow in the lemon. Positive ions (cations) moved toward copper electrodes (cathodes), and negative ions (anions) move toward zinc electrodes (anodes). These balance the charges building up
• Two cells in series provide more energy output than one. The clock may need more energy than can be supplied by one cell
• Batteries do not need external source of reactants, whereas a fuel cell must be supplied with reactants
Explanation: Edg 2021