Question

What is Galvanic cell​

Answer 1

Explanation:

A galvanic cell or voltaic cell, named after the scientists Luigi Galvani and Alessandro Volta, respectively, is an electrochemical cell in which an electric current is generated from spontaneous redox reactions.

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Answer 2

QuestioN :-

What is Galvanic Cell ?

ANsWeR :-

Galvanic cell (or) voltaic cell is an electrochemical cell that makes use of chemical reactions to generate electrical energy.

Principle of Galvanic Cell :-

• Electric work done by a galvanic cell is mainly due to the Gibbs energy of spontaneous redox reaction in the voltaic cell.
• It generally consists of two half cells and a salt bridge.
• Each half cell further consists of a metallic electrode dipped into an electrolyte.
• These two half-cells are connected to a voltmeter and a switch externally with the help of metallic wires.
• In some cases, when both the electrodes are dipped in the same electrolyte, a salt bridge is not required.

Parts of Galvanic Cell :-

1. Anode
2. Cathode
3. Salt Bridge
4. Half - Cells
5. External Circuit
6. Load

How Galvanic Cell Works :-

• In a galvanic cell, when an electrode is exposed to the electrolyte at the electrode-electrolyte interface, the atoms of the metal electrode have a tendency to generate ions in the electrolyte solution leaving behind the electrons at the electrode. Thus, making the metal electrode negatively charged.
• While at the same time metal ions in the electrolyte solution too, have a tendency to deposit on a metal electrode. Thus, making the electrode positively charged.
• Under equilibrium condition, charge separation is observed and depending on the tendencies of two opposing reactions, the electrode can be positively or negatively charged. Hence, a potential difference is developed between the electrode and electrolyte.
• This potential difference is known as electrode potential.
• Out of two electrodes, the electrode at which oxidation takes place is called anode while the electrode at which reduction takes place is called cathode.
• The anode has a negative potential with respect to the solution while the cathode has a positive potential with respect to the solution.
• Thus, a potential difference develops between two electrodes of the galvanic cell. This potential difference is known as cell potential.
• When no current is drawn from the galvanic cell, cell potential is known as the electromotive force of the galvanic cell.
• When the switch is set on, due to the potential difference, electrons flow from the negative electrode to the positive electrode.