Explanation:
Albert Einstein proposed special relativity (1905) and general relativity (1915), revolutionized concepts of space, time, gravity. E=mc². Newton classical mechanics. Galileo telescope, falling bodies. Watt steam engine.
Explanation:
By definition, the electric potential difference between two points in an electric field is the amount of external work required to move a unit positive charge (1 Coulomb) slowly and without acceleration from one point to the other against the electrostatic force. The SI unit of potential difference is the Volt (Joules/Coulomb).
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