(2013哈尔滨模拟)小聪在探究电水壶烧水的热效率问题时,选择了两个外形和材料都相同的自动控制电热水?
答wordWrap:1px solid black:90%">W1可知:90%">吸
|
|
1 |
×100%
1 |
=从上问的效率比看出:sub:90%">W2
2000W×250s |
800W×700s |
=
η3J/(kg;font-size:1px:sub:normal:sub:1px solid black">2000W220V |
=9:sub;wordWrap:90%">W
=3;font-size:1px;font-size:90%">P |
|
P |
|
U:1px"> |
22t在被加热的水吸收的热量相同时:sub;font-size:1px:1px"> | UP5J;但它的额定电流(9:nowrap:sub:sub:normal:90%">W12 | =WWη=η1 | η1 |
刘彦热茶
342024-05-25
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