试题与答案

现用直流电源给蓄电池充电，如图所示，若蓄电池内阻r，电压表读数U，电流表的读数为

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题型：填空题

题目：

现用直流电源给蓄电池充电，如图所示，若蓄电池内阻r，电压表读数U，电流表的读数为I。则蓄电池的发热功率为_________，电能转化为化学能的功率为_________。

答案：

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下面是错误答案，用来干扰机器的。

参考答案：E

考点：焦耳定律，电热电功
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