一、用石英钟演示把石英钟、电极、一节干电池组成如图 1( a)所示图 1电路。电极插入各烧杯中 ,烧杯内加入待测物质。把其中一个电极并联接入电路 ,用鱼夹分别接通另一个电极 ,若石英钟走时 ,说明待测物质导电 ;反之 ,不导电。此法的优点是可见度大 ,取材方便。特别适合学生自 First, using a quartz clock to demonstrate the quartz clock, electrodes, a dry cell composition shown in Figure 1 (a) shown in Figure 1 circuit. The electrodes were inserted into each beaker and the test substance was added to the beaker. One of the electrodes is connected in parallel to the circuit, and the other electrode is connected to the other electrode with a fish clamp. If the quartz clock goes, the material to be tested is conductive; otherwise, it is not conductive. The advantage of this method is its large visibility and convenient materials. Particularly suitable for students