The invention of the resistor.

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A resistor is a two-terminal electric circuit component that offers opposition to an electric current in order to control the current and voltage. Resistors absorb power from a circuit and convert it into heat. In electronic equipment, they often constitute up to 80% of all components[1].


The American polymath Benjamin Franklin invented[2] the resistor in 1748 after investigating the level of electrical conductivity of earth (dry versus wet). He filled a glass tube, open at both ends, with dry earth and inserted a wire through it and discharged a Leyden jar while placing himself in the circuit. He stated that the dry earth “would not conduct the least perceptible shock”. Here is an illustration of the circuit:

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Here is an oil painting[3] of Benjamin Franklin:

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  2. 1941:+Experiments+and+Observations+on+Electricity&source =gbs_navlinks_s, pages 35 and 36.