题目内容
(6分)如图所示,R1=20Ω,R2=30Ω,电源电压为6V保持不变,S闭合后,求:
⑴通过R1的电流;
⑵R2两端的电压;
⑶1min内电路消耗的电能.
⑴通过R1的电流;
⑵R2两端的电压;
⑶1min内电路消耗的电能.
⑴ I=U/(R1+R2)=6V/50Ω=0.12A
⑵ U2=IR2="0.12A×30Ω=3.6V"
⑶ W=U2t/R总=(6V)2×60s/50Ω="43.2" J
⑴ I=U/(R1+R2)=6V/50Ω=0.12A
⑵ U2=IR2="0.12A×30Ω=3.6V"
⑶ W=U2t/R总=(6V)2×60s/50Ω="43.2" J
⑵ U2=IR2="0.12A×30Ω=3.6V"
⑶ W=U2t/R总=(6V)2×60s/50Ω="43.2" J
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