General Knowledge

Faraday’s Law of Electrolysis

Faraday’s Law of Electrolysis

First law of electrolysis

It states that the quantity of elements separated by passing an electric current through a molten or dissolved salt is proportional to the quantity of electric charge passed through the circuit.
          w ɷ Q;
        w = ZQ = Zit

Secondary Law of Electrolysis

The amounts of different substances liberated at the electrodes by the same quantity of electric charge passing through the electrolytic solution are proportional to their chemical equivalent weights:
          w ɷ Q;


An electric battery is a device consisting of one or more electrochemical cells, with external connections provided to power electrical devices such as flashlight, smartphone, and electric cars. When a battery is supplying electric power, its positive terminal is the cathode and its negative terminal is the anode. In simple terms, ‘it is an arrangement of one or more cells connected in series. So, it is basically a Galvanic cell.

These are of two types :
1. Primary Batteries :
They can produce current immediately on assembly. These are most commonly used in portable devices that have low current drain.
Example : Zinc-Chloride batteries, Alkaline batteries.

2. Secondary Batteries :
They also known as rechargeable batteries and must be charged before first use; they are usually assembled with active materials in the discharged state. Rechargeable batteries are (re) charged by applying electric current, which reverse the chemical reaction that occurs during discharge.
Example : Useful batteries in mobile phones and laptop computers