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一、问题提出问题源于一道试题。题目:如图1为电热毯的电路示意图。电热毯接在u=311sin100πt(V)的电源插座上,电热毯被加热到一定程度后,由于装置P的作用,使加在电热丝ab两端的电压变为如图2所示的波形,从而进入保温状态。若电热丝电阻保持不变,此时图1中交流电压表读出交流电的有效值是()。A.156V:B.220V;C.311V;D.110V。参考答案:A。这是一道物理理论联系生活实际的创新型试题现在已经频繁出现在各地高三调研考试当中,原题
First, the question raised The question stems from a test. Title: Figure 1 shows the circuit diagram of electric blanket. The electric blanket is connected to the power socket with u = 311sin100πt (V). After the electric blanket is heated to a certain extent, the voltage applied across the heating wire ab becomes the waveform shown in FIG. 2 due to the function of the device P Into the insulation state. If the resistance of the heating wire remains the same, the AC voltage meter in Figure 1 at this time read out the effective value of AC (). A.156V: B.220V; C.311V; D.110V. Reference answer: A. This is a physical theory with the actual life of innovative questions now frequently appear in the senior high school examinations, the original title