Question

What is the Apparatus used for the electrolysis of water called:

Answer 1

In order to answer this question, first we will mention the name of the device which is the Apparatus used for the electrolysis of water, and then we will describe the concept of it. And then we will also discuss why it is generally used.

Complete answer:
Hoffman’s Voltameter is the device used for electrolysis of water.
August Wilhelm von Hofmann (1818–1892) created the Hofmann voltameter in 1866 as a device for electrolyzing water. It is made up of three connected upright cylinders, usually made of glass. The top of the inner cylinder is open, allowing water and an ionic chemical to promote conductivity, such as a little amount of sulfuric acid, to be added. Inside the bottom of each of the two side cylinders, a platinum electrode is attached to the positive and negative terminals of an electrical source. Gaseous oxygen forms at the anode and gaseous hydrogen forms at the cathode when current is sent via Hofmann's voltameter. Water is displaced by each gas, which gathers at the top of the two outer tubes.
Daniell developed the term 'voltameter,' shortening Faraday's original designation of "volta-electrometer." Voltameters made by Hofmann are no longer used as electrical measurement instruments.
Voltmeters, on the other hand, were frequently used to measure direct current before the invention of the ammeter, because current through a voltmeter with iron or copper electrodes electroplates the cathode with an amount of metal from the anode directly proportional to the total coulombs of charge transferred (Faraday's law of electrolysis).

Note:
By weighing the cathode, the amount of electricity that has travelled through the system can be determined. Voltameters were employed as power metres by Thomas Edison. (Because the platinum electrodes are too inert for plating, a Hofmann voltameter cannot be used to weigh electric current in this manner.)