有这样两个成语与本文有关,一是殊途同归,二是事半功倍。现在用一道习题解释一下这两个成语。人教版八年级物理下册第51页第二题是这样的,“一个额定功率为450瓦的电饭锅,在220伏额定电压下使用,每分钟产生多少焦耳的热量?”学生在解答这道习题时,很多先求电流和电阻再根据焦耳定律求出结果,这样做因为在计算时所求电流值、电阻 There are two idioms related to this article, one is the same thing, the second is to do more with less. Now use an exercise to explain these two idioms. The second question is, "How much joule per minute does a rice cooker with a rated power of 450 watts, at 220 volts of rated voltage, produce? In answer to this exercise, a lot of first seek the current and resistance and then find the result according to Joule's law, because in the calculation of the current value, the resistance