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全国统编教材初中物理第二册 P188有这样一道题:“串联在电路里的两盏电灯 L_1和L_2,如果 L_1的电阻比 L_2的电阻大,那么哪盏灯两端的电压大?在相等时间里,电流通过哪盏灯所做的功多?哪盏灯更亮些?”对这道题,人教社出版的教学参考书上给出的解答是“由于灯L_1和 L_2串联,……在 I、t 相同的情况下,灯 L_1两端电压较大.电流通过它所做的功多,所以 L_1更亮些。”类似的习题及解答经常出现在中学物理各类参考资料及一些升学试题中。我们看到在这些解答中,一般都把电灯实际功率的大
The textbook P188 for junior high school physics textbooks in the whole country has this question: “Two lamps L_1 and L_2 connected in series in the circuit. If the resistance of L_1 is greater than the resistance of L_2, then the voltage across the lamp is large and equal. In the course of time, the current through which lamp does more work? Which lamp is more bright?” For this question, the answer given in the teaching reference book published by the People’s Education Society is “ because the lamp L_1 and L_2 are connected in series. ...... In the same case with I and t, the voltage across lamp L_1 is large. The current through it does more work, so L_1 is more bright.” Similar problems and answers often appear in various types of reference for middle school physics Information and some questions for further studies. We see that in these solutions, the actual power of the lamp is generally large