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考测点导航《电和磁(一)》包括磁现象和磁场两方面内容,对这部分知识的要求是知道磁体的吸铁性、指向性和磁极间的相互作用,知道磁体周围的磁场、电流周围的磁场及磁感线,知道电磁铁、电磁继电器的构造和工作原理,会用右手螺旋定则确定相应磁体的磁极和通电螺线管的电流方向。
The test point navigation “Electricity and Magnetics (I)” includes both magnetic phenomena and magnetic fields. The requirement for this part of knowledge is to know the magnetic properties of the magnets, the directivity and the magnetic pole interaction, and to know the magnetic field around the magnets. The magnetic field and magnetic induction lines around the current, knowing the structure and working principle of the electromagnet and the electromagnetic relay, will use the right-handed spiral rule to determine the current direction of the magnetic pole and the energized solenoid of the corresponding magnet.