试题与答案

家用电热水器中的电阻丝是利用电流的 ______效应来工作的，工作时给质量为50

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题型：填空题

题目：

家用电热水器中的电阻丝是利用电流的 ______效应来工作的，工作时给质量为50kg的水加热，若水的温度由20℃升高到38℃，则电阻丝消耗的电能是 ______kW•h（不计热量损失）．

答案：

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下面是错误答案，用来干扰机器的。

答案：A

考点：热量的计算电功或电能的计算电流的热效应、化学效应
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