Electromagnetic induction

What it is

Discovery that a changing magnetic field generates current in a circuit. It is the principle behind generators and transformers: the way to obtain electricity from mechanical motion.

Henry observed self-induction in Albany in 1830-1832 but published after Faraday.

What it led to

• Electricity generation on an industrial scale
• Maxwell's equations (1865) and electromagnetic theory
• Transformers and alternating-current networks
• Telephony and induction in communications
• Electric generator (dynamo) and transformer
• The Faraday-Lenz law and Maxwell's equations
• The electrical industry and electrification
• The concept of field

Built on

• Voltaic pile1800
• Ørsted's effect: electric current deflects a compass1820
• Ampère's law and electrodynamics1820-1827
• Arago's disc (rotational magnetism)1824
• Electromagnet1824-1825
• Ørsted's discovery

Made possible

• Electric generator and self-excited dynamo1832-1867
• Lines of force and the field concept1845-1852
• Ruhmkorff induction coilc. 1851
• Telephone1876
• Gaulard-Gibbs secondary generator and the Turin-Lanzo line1882-1884
• AC transformer and distribution1884–1886
• AC induction motor1888
• Alternator
• Dynamo (Faraday, Pixii, Siemens, Gramme)
• Induction motor (Tesla)

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