The Charge

The short story of the preface is about the impression of a soldier before he enters the fight. The day of fighting is not important. There is no doubt that these ideas are the continuation of human history. From cave people to tomorrow's space station, these ideas always exist. ***** The appearance of war will never change. Humans gather at the end of the diameter of the field. Whether it is corn, wheat, or just grass covered with wild grass, its field is irrelevant. People on each shoulder of the venue need to be charged.

The basic charge unit is the charge obtained by electrons or protons. By convention, we treat the electrons as negative charges, denote them as "-e", and the charge on the protons is only "". The principle of charge quantization was first proposed when proposing experimental law of electrolysis by British experimenter Faraday. In 1912, Milikan finally proved and proved this principle.

Electricity is related to charge, and both electrons and protons are charged. Each particle has the same amount of charge, but the sign is opposite. Electrons are negatively charged, and protons are positively charged. The objects around us contain billions of atoms, each containing many protons and electrons. The proton is in the center of the atom and is concentrated in a small area called the nucleus. Nuclear motile protons of orbital electrons are essentially confined in the nucleus and can not escape from the nucleus. As a result, it mainly moves electronic equipment that is in charge of electricity.

An atom is composed of three elementary particles: proton, electron, and neutron. Atomic nucleus (center) contains protons (positively charged) and neutrons (no charge). The outermost region of an atom is called an electron shell and contains electrons (negatively charged). Atoms have different characteristics depending on the arrangement and number of their elementary particles. The mass of protons and neutrons is about the same, about 67 x 10 - 24 grams. Scientists define this mass as atomic mass unit (amu) or dalton. The masses are similar, but the protons are positively charged, but the neutrons do not have electric charges. Therefore, the number of neutrons in the atom greatly contributes to its mass, but it does not contribute to its charge.