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拉线盘分为混凝土拉线盘和石材拉线盘，它装设于拉线的最下部，深埋在土壤内。起固定拉线的作用
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过负荷保护是将热继电器的三相主触头串入电动机接线主回路中，将热继电器的动开触点(常开触点)串入到电动机起动控制回路中
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自耦降压起动器又称起动补偿器，利用它降压后起动电动机，以达到限制起动电流的目的
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在供电企业的供电设施上擅自接线用电，属于破坏电力设施的行为
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在磁场中任一点处，当运动电荷以同一速度沿着不同的方向运动时，电荷受到的磁场力大小是不同的
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