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热敏电阻的理论研究和应用开发已取得了引人注目的成果,随着高、精、尖科技的发展,热敏电阻的应用也越来越广泛.以热敏电阻和温控电路为情景的试题也随之出现,体现了“从生活走向物理,从物理走向社会”的新课程理念,还能引起学生关注身边的科技事件和新材料的应用情况,因而倍受命题者青睐,成为近几年中考试题中的新亮点.例1由热敏电阻、电磁继电器、电源、开关、滑动变阻器、电炉丝等组成的温控电路如图1所示,闭合S,当室内温度低于
Thermistor theoretical research and application development has made remarkable achievements, with the development of high, sophisticated and cutting-edge technology, the application of thermistor is also more and more widely.Taking thermistor and temperature control circuit as the scene Of the questions also appear, reflecting the “from life to physics, from physics to society ” the new curriculum concept, but also cause students to focus on the side of the scientific and technological events and the application of new materials, which greatly favored by the proponents, Become a new bright spot in the examination questions in recent years.Example 1 by the thermistor, electromagnetic relay, power supply, switches, sliding rheostat, electric wire and other components of the temperature control circuit shown in Figure 1, closed S, when the room temperature is below