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1.比例例11安的电流通过一段金属导线,经过10秒钟产生一定的热量,如果电流增加到3安时,经过相同的时间,产生的热量是前者的()(A)1/9.(B)1/3.(C)3倍.(D)9倍.
1. Proportional Example 11 An electric current passes through a section of metal wire and generates a certain amount of heat after 10 seconds. If the current increases to 3A, after the same time, the heat generated is the former () (A) 1/9. (B) 1/3. (C) 3 times. (D) 9 times.