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在中考中,热电综合题题目难度不大,但失分较多,现举两例加以分析.例1 (2002年山东日照市)某校物理兴趣小组的同学,利用社会实践活动的时间,在指导老师的带领下,制作了一台简易太阳能热水器.这台热水器在夏天可将60千克水的温度由20℃升高到70℃.试求:(1)在此过程中这些水吸收了多少焦耳的热量?(2)如果这些热量由“220V1000W”的电热水器正常工作时产生,则此热水器需要工作多少小时?
In the middle school entrance examination, the title of the thermoelectric synthesis problem is not difficult, but there are many points of loss. Now we will give two cases for analysis. Example 1 (In 2002, Rizhao City, Shandong Province) A class of students in the Physics Interest Group used the time of social practice activities. Under the guidance of the instructor, a simple solar water heater was produced. This water heater can increase the temperature of 60 kilograms of water from 20°C to 70°C in the summer. Try out: (1) How much water these water absorbed in the process Joules of heat? (2) If this heat is generated by the “220V1000W” electric water heater, how many hours does the heater need to work?