In what year did Joseph Henry invent a precursor to the Electric Doorbell?
1831
1832
1833
1834
Answer
In 1831, Joseph Henry invented an electromagnet, which is a precursor to the electric doorbell. An electromagnet is a type of magnet that is created by passing an electric current through a coil of wire. The magnetic field created by the current can be turned on and off by turning the current on and off.
Unveiling the Legacy: Joseph Henry Quiz
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