Electric Charge | 电荷

📚 Electric Charge | 电荷

Electric charge is a fundamental concept in physics that explains a wide range of phenomena, from lightning to the operation of electrical circuits. In the IGCSE Edexcel Physics syllabus, understanding charge helps you grasp how current flows and how static electricity builds up. This article covers the nature of charge, atomic structure, conductors and insulators, methods of charging, electric fields, and the relationship between charge and current.

电荷是物理学中的一个基本概念，可以解释从闪电到电路工作的各种现象。在IGCSE爱德思物理大纲中，理解电荷有助于你掌握电流如何流动以及静电如何积累。本文涵盖电荷的本质、原子结构、导体与绝缘体、起电方法、电场以及电荷与电流的关系。

1. What is Electric Charge? | 什么是电荷？

Electric charge is a fundamental property of particles that causes them to experience a force when placed in an electric field. Charge is measured in coulombs (C). All charged objects interact: like charges repel, unlike charges attract. Protons carry positive charge and electrons carry negative charge. The charge on a single electron is -1.6 × 10⁻¹⁹ C. A neutral object contains equal numbers of protons and electrons.

电荷是粒子的一种基本属性，使它们在电场中受到力的作用。电荷的单位是库仑（C）。所有带电物体都会相互作用：同种电荷相斥，异种电荷相吸。质子带正电，电子带负电。单个电子的电荷是 -1.6 × 10⁻¹⁹ 库仑。中性物体含有相等数量的质子和电子。

2. Atomic Structure and Charge Carriers | 原子结构与电荷载体

All matter consists of atoms. Each atom has a nucleus containing protons (positive) and neutrons (neutral), surrounded by orbiting electrons (negative). Protons are fixed in the nucleus and cannot move from atom to atom; electrons, especially the outer ones, are relatively free to move and are responsible for transferring charge. In solid conductors, free electrons are the charge carriers; in liquids and gases, ions also act as charge carriers.

所有物质都由原子组成。每个原子有一个原子核，包含质子（带正电）和中子（不带电），周围有绕核运行的电子（带负电）。质子固定在原子核内，不能从一个原子移动到另一个原子；电子，特别是外层电子，相对自由移动，负责电荷的转移。在固态导体中，自由电子是电荷载体；在液体和气体中，离子也可作为电荷载体。

3. Positive and Negative Charges | 正电荷与负电荷

There are two types of electric charge, named positive and negative. Objects with the same type of charge repel each other, while objects with opposite charges attract. When an object gains electrons, it becomes negatively charged; when it loses electrons, it becomes positively charged. The magnitude of any charge is always an integer multiple of the elementary charge e = 1.6 × 10⁻¹⁹ C. This discrete nature is important at the atomic scale, but for most macroscopic phenomena we treat charge as continuous.

电荷有两种类型，称为正电荷和负电荷。带有同种电荷的物体相互排斥，而异种电荷相互吸引。物体获得电子时带负电，失去电子时带正电。任何电荷的大小总是基本电荷 e = 1.6 × 10⁻¹

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