Electromagnets are simple devices t

电磁铁是模拟天然磁铁的行为，有一个重要区别简单设备：改变，因为它们的电所产生的磁场的他们的磁场强度的能力。改变任何一个电磁铁的四个基本要素，您可以根据需要设置的场强。<br><br>影响电磁体的强度的四个主要因素是循环计数，电流，线大小，和铁芯的存在。<br>圈数<br>电磁铁由出导线围绕金属芯缠绕的线圈的-通常是铁-和连接到电池。为围绕线圈的线圈的电流移动时，它会产生这样的一个小棒磁体的磁场。它有环路的一侧，而另一南极北极。因为线圈被一个连续的金属丝制成的，每个环的磁场“堆叠”，创建就像一个大的磁棒。以增加或减少所述磁场的强度的一种方法是改变在线圈回路的数量。越是循环添加，较强的领域将成为。更环路删除，该场弱就越小。<br>金属芯<br>线圈内的金属放大由它产生的场。改变金属芯为不同的金属会使电磁铁更强或更弱。铁芯作出很强的领域。钢芯使弱领域。钕蕊最强的领域。部分滑动芯出来的线圈会减弱磁场，因为较少的金属的是在其内。<br><br><br>电池电流<br>通过电磁铁改变流动的电流的量也将改变其产生的场。在线圈中的电流，强磁场将增长越大。相反地，降低了电池电压降低的电流，削弱字段。这一事实有并发症，但是：当你增加电流，线圈线变热，并可能炒细腻的电绝缘性，而不该磁铁不能工作。<br>电线尺寸<br>尽管金属丝是电的非常有效的导体，它们仍然有电流的流动一定的阻力。使用较大的线圈线的计将减小这个先天抗性。这将增加电流，从而领域。采用较小的仪表会增加阻力，降低电流和减弱磁场。使用不同类型的金属丝的也会影响场强，因为每个金属具有当前不同的固有电阻。

Electromagnets are simple devices that mimic the behavior of natural magnets, with one important difference: the ability to change their magnetic field strength because of their electrically generated magnetic fields. Varying any of the four basic elements of an electromagnet allows you to set the field strength as needed.<br><br>The four main factors that affect the strength of an electromagnet are the loop count, the current, the wire size, and the presence of an iron core.<br>Number of Loops<br>An electromagnet is made out of a coil of wire wrapped around a metal core -- usually iron -- and connected to a battery. As the electrical current moves around the loops of the coil, it generates a magnetic field like that of a small bar magnet. It has a north pole on one side of the loop and a south pole on the other. Because the coil is made out of one continuous wire, the magnetic fields of each loop “stack up,” creating something like a large bar magnet. One way to increase or decrease the strength of the magnetic field is to change the number of loops in the coil. The more loops you add, the stronger the field will become. The more loops you remove, the weaker the field will become.<br>The Metal Core<br>The metal inside the coil magnifies the field created by it. Changing the metal core for a different metal will make the electromagnet stronger or weaker. Iron cores make for very strong fields. Steel cores make weaker fields. Neodymium cores make the strongest fields. Sliding the core partially out of the coil will weaken the field, because less of the metal is within it.<br><br><br>Battery Current<br>Changing the amount of current flowing through the electromagnet will also change the field the it produces. The greater the current in the coil, the stronger the magnetic field will grow. Conversely, lowering the battery voltage decreases the current, weakening the field. This fact has a complication, however: when you increase the current, the magnet wires get hotter, and possibly fry the delicate electrical insulation without which the magnet can't work.<br>Wire Size<br>Although metal wires are very efficient conductors of electricity, they still have some resistance to the flow of current. Using larger gauges of wire on the coil will decrease this innate resistance. This will increase the current and therefore the field. Using smaller gauges will increase the resistance, reduce the current and weaken the field. Using different types of metal wire will also affect the field strength, because every metal has a different inherent resistance to current.

电磁铁是模拟天然磁铁行为的简单装置，有一个重要的区别：由于它们的电生磁场而改变其磁场强度的能力。改变电磁铁的四个基本元素中的任何一个都可以根据需要设置磁场强度。<br>影响电磁铁强度的四个主要因素是线圈数、电流、导线尺寸和铁芯的存在。<br>循环次数<br>电磁铁是由缠绕在金属芯（通常是铁芯）上的一圈电线制成，并与电池相连。当电流绕着线圈的线圈移动时，它会产生一个类似于小磁铁棒的磁场。它在环的一边有一个北极，另一边有一个南极。因为线圈是由一根连续的导线组成的，所以每个线圈的磁场“叠加”在一起，形成一个类似大磁棒的东西。增加或减少磁场强度的一种方法是改变线圈中的线圈数。添加的循环越多，场就越强。移除的循环越多，场就越弱。<br>金属芯<br>线圈内的金属放大了线圈产生的磁场。把金属芯换成不同的金属会使电磁铁变强或变弱。铁心构成非常坚固的田地。钢芯使磁场变弱。钕磁芯构成最强的磁场。把磁芯部分滑出线圈会减弱磁场，因为里面的金属更少。<br>电池电流<br>改变流过电磁铁的电流量也会改变它产生的磁场。线圈中的电流越大，磁场就越强。相反，降低电池电压会降低电流，削弱磁场。然而，这一事实有一个复杂的问题：当你增加电流时，磁线会变得更热，而且可能会烧坏脆弱的电绝缘层，没有它磁铁就无法工作。<br>导线尺寸<br>尽管金属线是非常有效的导电体，但它们对电流的流动仍有一定的阻力。在线圈上使用更大的线规将减少这种固有电阻。这将增加电流，从而增加磁场。使用较小的仪表将增加电阻，减少电流，削弱磁场。使用不同类型的金属丝也会影响磁场强度，因为每种金属对电流的固有电阻不同。