The Daniell cell is a primary cell with a constant electromotive force of 1.1 volts. It usually consists of a copper electrode in a copper sulphate solution and a zinc electrode in dilute sulphuric acid or zinc sulphate; the solutions are separated by a porous partition or by gravity.
The English chemist and physicist John Frederic Daniell invented the Daniell cell in 1836 after looking for a way to solve the problem of hydrogen bubbles forming on voltaic piles. He called it the “constant battery”. Here is an illustration of his original cell:
[ux_image_box img=”1476″ image_width=”70″]
Here is an oil painting of John Frederic Daniell:
[ux_image_box img=”1480″ image_width=”50″ link=”https://artuk.org/discover/artworks/john-frederic-daniell-frs-215672″ target=”_blank”]