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German physicist and teacher Georg Ohm researched the relationship between voltage, current and resistance. In 1827, he proved that the amount of electrical current that can flow through a substance depends on its resistance to electrical flow. This is known as Ohm's Law.

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Michael Faraday (1791-1867)

Michael Faraday, a British physicist and chemist, was the first person to discover that moving a magnet near a coil of copper wire produced an electric current in the wire.

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Thomas Edison (1847-1931)

American inventor Thomas Edison purchased Henry Woodward's patent and began to work on improving the idea. He attached wires to a thin strand of paper, or filament, inside a glass globe. The filament began to glow, which generated some light. This became the first incandescent light bulb. A thin, iron wire later replaced the paper filament.

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Nikola Tesla (1856-1943)

A Serbian inventor named Nikola Tesla invented the first electric motor by reversing the flow of electricity on Thomas Edison's generator. In 1885, he sold his patent rights to an American businessman who was the head of the Westinghouse Electric Company. In 1893, the company used Tesla's ideas to light the Chicago World's Fair with a quarter of a million lights.

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André-Marie Ampère (1775-1836)

André-Marie Ampère, a French physicist and science teacher, played a big role in discovering electromagnetism. He also helped describe a way to measure the flow of electricity. The ampere, which is the unit for measuring electric current, was named in honour of him.

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Alessandro Volta (1745-1827)

Using zinc, copper and cardboard, this Italian professor invented the first battery. Volta's battery produced a reliable, steady current of electricity. The unit of voltage is now named after Volta.