was an English bookbinder who trained himself in electricity and grew to be regarded as one of the greatest experimenters ever. He obtained an assistantship in Davy's lab, and then began to conduct his own experiments. He produced an amazing quantity of work on electricity. His discoveries include electromagnetic induction, the battery (electropotentials), the electric arc (plasmas), the dynamo (a device capable of converting electricity to motion), and the laws of chemical electrodeposition of metals from solutions. His work on induction formed the basis of modern electromagnetic technology. Faraday also was an advocate of the law of conservation of energy, believing that possibility of "the production of any one [power] from another, or the conversion of into another." His work on electrochemistry, including the first and second laws of electrolysis, laid the basis for electrochemistry, another important modern industry.