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现行人教版小学科学教材四年级下册“导体与绝缘体”一节,其内容是学生用“电路检测器”来判断身边20种材料哪些是导体,哪些是绝缘体。教材中的“电路检测器”用一个1.5 V的干电池与一只钨丝白炽灯泡用导线连起来,组成闭合电路,将回路的一处断开,伸出两个接头做“电路检测器”的两个检测头。若将两个检测头直接接触,则小灯泡亮;若分别触及橡皮的两端,灯泡不亮,则说明橡皮不是导体,从而用这一方法来判断导体与绝缘体。
The current PEP teaching primary school textbook fourth grade volumes “conductor and insulator ” section, the content is the student “circuit detector ” to determine around 20 kinds of material which is the conductor, which is the insulator. Textbook “circuit detector” with a 1.5 V battery and a tungsten filament incandescent bulbs with wires connected to form a closed circuit, the circuit is disconnected, extending two connectors do “circuit test Device ”two test head. If the two test heads are in direct contact, the small bulb is bright; if the two ends of the eraser are touched separately, the bulb is not bright, then the rubber is not a conductor, so that the conductor and the insulator are judged by this method.