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一、素材人们喜欢用电能来做饭、烧开水,电热壶也深受人们喜爱．小明想研究电热壶的内部构造．便用螺丝刀拆开了电热壶．并观察了它的结构．二、题目1．小明观察壶盖时发现中间有一小孔．请结合你所学的物理知识解释这个小孔有什么作用．2．用螺丝刀将壶盖反面的螺丝旋下,发现小孔上有簧片．请问簧片起什么作用?并解释原因．3．烧水时,水能不能装满?为什么? 4．电热圈尾部的两个铜脚是接电源的,它们是通过橡皮垫圈与铝合金的壶体绝缘的．因为橡皮垫圈是____．
First, material people like to use electricity to cook, boil water, electric kettle is also very popular. Xiaoming wanted to study the internal structure of the electric kettle. Then opened the electric kettle with a screwdriver. And observed its structure. Second, the topic 1. Xiaoming found a small hole in the middle of the lid. Please explain the role of this hole in combination with the physical knowledge you have learned. 2. Screw the screw on the opposite side of the lid with a screwdriver and find the reed on the hole. What is the effect of reeds and explains why? 3. When water is boiled, can the water fill up? Why? The two copper feet at the end of the heating coil are connected to the power supply. They are insulated from the aluminum alloy body by rubber gaskets. Because the rubber gasket is ____.