Question

which resign did Greeks knew producing sparks on rubbing continuesly? ​

Answer 1

Answer:

Around 600 BC, Greek philosopher Thales of Miletus observed that amber could be electrified when rubbed with a cloth and attract other objects and produce sparks. In 1671, Leibniz discovered that sparks were associated with electrical phenomena.In 1708, Samuel Wall performed experiments with amber rubbed with cloth to produce sparks. In 1752, Thomas-François Dalibard, acting on an experiment proposed by Benjamin Franklin, arranged for a retired French dragoon named Coiffier in the village of Marly to collect lightning in a Leyden jar thus proving that lightning and electricity were equivalent. In Franklin's famous kite experiment, he successfully extracted sparks from a cloud during a thunderstorm.