The term 'quantity of electricity' can be summarized by the word 'faraday, ' which is a unit of electrical charge named after the English scientist Michael Faraday. Faraday discovered the principles of electromagnetic induction, diamagnetism, and electrolysis, and his work laid the foundation for the modern understanding of electricity. The faraday is equal to the amount of electric charge transferred by a current of one ampere in one second.