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Transformers are devices that transfer a voltage from one circuit to another circuit via induction.
Electricity goes through some ups and downs on its way from the power plant to your house. Here's how it works.
Invented decades before it could be used, the first type of electric light was so brilliant it was used for lighthouses and street lamps.
In 1906, American physicist Lee De Forest invented the Audion (or triode), building on the discovery of the diode just a few years before.
English mathematician Peter Barlow devised an instrument in 1822 that built on advances from earlier in the century (including the invention the battery) to create a very early kind of electric motor.
This nifty device, a kind of precursor to the Slinky, demonstrates how parallel wires attract.
English chemist John Frederick Daniell came up with a twist on the simple voltaic cell that resulted in a longer-lasting source of power.
When electricity became available to the masses, utilities needed meters to record customer usage. This early 20th century model resembles many in use today.
Though simple by today's standards, the early electrostatic generators were a great milestone in humankind's understanding of electricity, allowing scientists to produce electricity so they could study it.
Out of a humble ice pail the great experimentalist Michael Faraday created a device to demonstrate key principles of attraction, repulsion and electrostatic induction.