Electric conductivity

1821 Electric conductivity

The book of science

Tom Sharp

Humphry Davy, Henry Cavendish electromagnetism

Electric conductivity

The electrical researches of the Honourable Henry Cavendish

Electric fluid

Cavendish’s “electric fluid” model was not far off considering that electrons would not be discovered until 1897.

Cavendish measured conductivity by how much of a shock it gave him. Davy measured resistance by how much a conducting wire would heat oil that it was submerged in, and he measured electromagnetism by how much iron filings the electromagnet would pick up.

Both Cavendish and Davy discovered that temperature effects conductivity.

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