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纵观近几年各省市中考试题,电学计算题中电热器的调档问题已成为常考内容。所谓电热器的调档也就是通过调节电路的阻值改变电热器的发热功率。根据P=UI=U2/R知,在电压不变的情况下,只要改变接入电路中的阻值R,就可以改变电热器的发热功率。电热器的调档电路大体有3种设计方案。
Looking at the examination questions in various provinces and cities in recent years, the issue of adjusting electric heaters in electric calculations has become a regular examination content. The so-called electric heater shift is to adjust the heating resistance of the electric heater by adjusting the resistance of the electric circuit. According to P=UI=U2/R, when the voltage is constant, the heating power of the heater can be changed by changing the resistance R in the access circuit. There are three design options for the electric heater’s shift circuit.