求学霸指点～ 5
A:WhatcanIdoforyou?B:Yes,I'dliketo_ablouseformysisterasabirthday_.A:WhatsizeasI_.B:Th...
A:What can I do for you?B:Yes,I'd like to_ a blouse for my sister as a birthday_.A:What size as I_.B:The same size as I_.A:Would she like this one? B:_,do you have_different from this one?A:what_about that one?B:The_is too dark. I want a brighter one. A:How about this one? B: It's too dear. Do you have _ cheaper? A: Why _ you go to the second floor and have a look?
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（1）此时L与R1并联
U=UL=6V
IL=PL/UL=3/6=0.5A
I=I1+IL
0.8=I1+0.5
I1=0.3A
R1=U/I1=6/0.3=20Ω
W1=U*I1*t=6*0.3*600=1080J
（2）此时L与R2串联
滑片在左端，灯泡实际电压=电源电压=额定电压
灯泡功率=额定功率=3W
滑片在右端，灯泡实际电压=电源电压/2=额定电压/2 (RL=R2=12Ω)
灯泡功率=额定功率/4=0.75W (P=U^2/R ,P与U^2成正比)
U=UL=6V
IL=PL/UL=3/6=0.5A
I=I1+IL
0.8=I1+0.5
I1=0.3A
R1=U/I1=6/0.3=20Ω
W1=U*I1*t=6*0.3*600=1080J
（2）此时L与R2串联
滑片在左端，灯泡实际电压=电源电压=额定电压
灯泡功率=额定功率=3W
滑片在右端，灯泡实际电压=电源电压/2=额定电压/2 (RL=R2=12Ω)
灯泡功率=额定功率/4=0.75W (P=U^2/R ,P与U^2成正比)
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