This unique invention provided “such a complete and simple solution for a difficult problem.'
The theoretical foundation was laid in the early 1830s, with the independent discovery of electromagnetic induction by Michael Faraday and Joseph Henry. They showed that a changing magnetic field can induce a current of a higher voltage or a lower one . But it took another half-century before Lucien Gaulard, John Dixon Gibbs, Charles Brush, and Sebastian Ziani de Ferranti could design the first useful transformer prototypes.
In his address to the American Institute of Electrical Engineers in 1912, Stanley rightly marveled at how the device provided “such a complete and simple solution for a difficult problem. It so puts to shame all mechanical attempts at regulation. It handles with such ease, certainty, and economy vast loads of energy that are instantly given to or taken from it. It is so reliable, strong, and certain.
The sheer number of transformers has risen above anything Stanley could have imagined, thanks to the explosion of portable electronic devices that have to be charged. In 2016 the global output of smartphones alone was in excess of 1.8 billion units, each one supported by a charger housing a tiny transformer.
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