(2012大连)图是某电吹风的简化电路图.M是电动机,R是发热电阻,S是选择开关.S接B、C时吹冷风,接C、?
答nowrap:1px solid black">220V
110Ω |
=2A:normal">
(220V)I=IM+IR=0, 干路的电流,且IM=0; (2)吹热风时:nowrap;wordSpacing:90%">2 |
P |
=答:normal:
W=UIt=220V×0:1px:1px">
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U=110Ω:nowrap:1px solid black">UR | =通过R的电流
liushuangr
332024-05-30
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