Arabs may be the first people to understand the nature of lightning. They may also recognize other sources of electricity earlier than other ethnic groups. As early as15th century ago, Arabs created the Arabic word "raad" to stand for "lightning" and used this word to refer to torpedoes.

In the ancient culture of the Mediterranean region, it has been recorded for a long time that rubbing amber sticks with cat hair will attract substances such as feathers. Around 600 BC, Thales, 640-546B. The ancient Greek philosopher c) made a series of observations on static electricity. Based on these observations, he thought that friction magnetized amber.

This is very different from the properties of magnetite and other minerals; Magnetite has natural magnetism. Thales' point of view is not correct. But later, science will confirm the close relationship between magnetism and electricity.

Extended data

Electrification phenomenon:

1. Frictional electrification is a physical phenomenon in which an object is charged by friction. The step of triboelectrification is to use two different insulators to rub each other, so that the outermost electrons can get enough energy to transfer. After triboelectrification, these two insulators must have equal and opposite charges.

2. Electrostatic adsorption means that when an object with static electricity approaches a tiny object without static electricity, the free charge on the surface of the tiny object is transferred, which induces the opposite electrical property to the object with static electricity and is attracted and attached by the object with static electricity. Using the principle of electrostatic attraction of light and small objects, the effect of industrial dust collection can be achieved.

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