Dimensional Analysis. Dimensional Analysis (also called Factor-Label Method or the Unit Factor Method) is a problem-solving method that uses the fact that any number or expression can be multiplied by one without changing its value. It is a useful technique.
In 1887, the first dry cell battery was invented. Unlike previous batteries, it used a paste electrolyte instead of a liquid.
Modern Battery Experiments. The earliest method of generating electricity was by inducing a static charge in some substance. In 1660, Otto von Guericke (1602-1686) constructed the first electrical machine consisting of a large sulphur globe that, when rubbed and turned, attracted feathers and small pieces of paper.