Galvani

1. The purpose of a galvanic cell is to generate electrical energy by connected electron transfer reactions. A galvanic cell is made up of two half cells connected by a salt bridge (KNO₃), each of these half cells consist of an electrode in an electrolyte solution. A voltmeter is connected to both electrodes by electrical wires to measure the electrical potential produced through the reaction. A complete circuit is created as the electrons flow in the wires and electrodes while the ions flow in the electrolyte solution through the salt bridge. Oxidation occurs in one of the half cells (anode), while reduction occurs in the other half cell (cathode).
2.
Galvanic cell Electrolytic cell
Uses spontaneous chemical reactions to generate electricity
Chemical energy electrical energy Use of electrical current to initiate a non-spontaneous electron transfer reaction
Electrical energy  chemical energy
Electrodes act as surface on which electron transfer occurs: anode & cathode Electrodes act as surface on which electron transfer occurs: anode & cathode
Exothermic chemical reaction Endothermic chemical reaction
Two half cells in electrolytes are placed in separate beakers Electrodes are placed in the same electrolyte solution
The anode is negative and cathode is the positive electrode. The anode is the positive electrode while the cathode is negative
Electrons flow from anode to cathode in external circuit Electrons enter through cathode and come out through anode
cells in electrolytes are placed in separate beakers Electrodes are placed in the same electrolyte solution
The anode is negative and cathode is the positive electrode. The anode is the positive electrode while the cathode is negative
Electrons flow from anode to cathode in external circuit Electrons enter through cathode and come out through anode