8 Electric coils通电的线圈 How does an electromagnetic crane work?电磁起重机是怎样工作的？ Prepare used electric bells, telephones, toy car motors, iron nails, thin wires with insulating skins, battery clips, alligator clips, batteries, tape, gate switches, large head pins, small magnetic pins, etc. to study.准备废旧电铃、电话听简、玩具车马达、铁钉、带绝缘皮的细导线、电池夹、鳄鱼夹、电池、胶带、闸刀开关、大头针、小磁针等来研究。 How do they work?它们是怎样工作的? I think the electric bell has inside... 我觉得电铃里面有… Take it apart and see.拆开看看 I have dismantled the motor inside the 4WD with coils...我拆过四驱车内的马达，里面有线圈… A device that uses an electric current through a wound coil to produce magnetism is called an electromagnet.利用电流通过绕制的线圈产生磁性的装置叫作电磁铁。 Electromagnet consists of two parts: the core and the coil.电磁铁由铁芯和线圈两部分构成。 Electromagnet is a device that converts electrical energy into magnetic energy.电磁铁是将电能转化成磁能的装置。 Electric bells, motors, handsets, electromagnetic cranes, etc. all use electromagnets to work.电铃、马达、听筒、电磁起重机等都是利用电磁铁来工作的。 Make an electromagnet and study its properties.做个电磁铁,研究它的特性。 What I found我的发现 There are many things in life that use electromagnets to work, so find them and tell us what they do.生活中利用电磁铁来工作的物品很多,找一找,说说它们都有什么作用。 |
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