51问答网 > 小明家新装一台电热水器，铭牌上各项参数如下表所示： 型号 容量⼀m3 额定电压⼀V 额定功率⼀W 保温范围⼀

小明家新装一台电热水器，铭牌上各项参数如下表所示： 型号 容量⼀m3 额定电压⼀V 额定功率⼀W 保温范围⼀

2025-03-15 03:43:51
推荐回答（1个）
回答1：

（1）∵ρ=
m
V
，
∴热水器水箱内注满水后水的质量m=ρV=1.0×103kg/m3×50×10-3=50kg；
（2）水吸收的热量：
Q=cm△t=4.2×103J/（kg?℃）×50kg×（75℃-25℃）=1.05×107J．
（3）∵Q吸=Q放=W电=Pt，
∴t=
Q吸
P
=
1.05×107J
1250W
=8400s=140min．
答：（1）热水器水箱内注满水后水的质量为50kg．
（2）满箱的水温度从25℃到75℃需要热量为1.05×107J．
（3）提供这些热量至少需要的通电时间为140min．

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