KS3 CIE Electromagnets 2.1.3: Electromagnets | KS3 CIE 电磁铁 2.1.3

📚 KS3 CIE Electromagnets 2.1.3: Electromagnets | KS3 CIE 电磁铁 2.1.3

Electromagnets are temporary magnets created by an electric current flowing through a coil of wire. They are central to many devices you use every day, from electric bells to scrapyard cranes. In this KS3 CIE topic 2.1.3, you will learn how to build an electromagnet, how to change its strength, and why a soft iron core makes such a big difference.

电磁铁是由电流通过线圈产生的临时磁铁。它们是许多日常设备的核心，例如电铃和废铁场起重机。在 KS3 CIE 2.1.3 这一主题中，你将学习如何制作电磁铁、如何改变它的强度，以及软铁芯为什么如此重要。

This topic also builds on your knowledge of circuits, current, and magnetic fields. By the end, you should be able to describe the magnetic effect of a current and explain how electromagnets are used in real life.

这一主题也建立在你对电路、电流和磁场的知识基础上。学完后，你应该能够描述电流的磁效应，并解释电磁铁在现实生活中的应用。

1. What Is an Electromagnet? | 什么是电磁铁？

An electromagnet is a solenoid, usually a coil of insulated copper wire, that becomes magnetic when an electric current passes through it. If the coil is wrapped around an iron core, the magnetic effect becomes much stronger. The magnet is temporary because it loses most of its magnetism as soon as the current stops.

电磁铁是一个螺线管，通常由绝缘铜线绕成线圈，当电流通过时会产生磁性。如果

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