Michael Faraday was possibly the greatest experimentalist known to the scientific world. At age 21, after attending lectures of Sir Humphry Davy, he sent his notes to Davy and requested a position. Davy was impressed with the young man and hired him at the Royal Institute. He led a long career there and eventually became the most popular science lecturer of his day. Perhaps his greatest contribution was the discovery of electromagnetic induction. While investigating electrolysis, he discovered that the amount of chemical produced is proportional to the amount of electricity passed. Along with William Whewell he coined the terms anode, cathode, electrode, electrolyte, and ion.