物理题啊,请进

2024-12-02 22:43:04
推荐回答(1个)
回答1:

(1)RB=U/I =2.0/0.10Ω=20Ω
(2)由图可知:U=6V,I=0.46A
I B=U/ RB=6/20A=0.3A
I A= I-I B=0.46A-0.3A=0.16A
P额A= U•IA=6×0.16W=0.96W
(3) 由表格和图可知:U=4V时:
I’=0.38A IB’=0.2A
IA’= I’-IB’ =0.38A-0.2A=0.18A
QA=WA=UIt=4V×0.18A×10s=7.2J
PB=U^2/RB
=(4V)^2/20Ω=0.8W