2)I2=U/R2=12/10=1.2(A)
3)R=R1/念手/R2=R1*R2/知高竖(R1+R2)=300/40=7.5(欧)
4)I=U/R=12/7.5=1.6(A)或搭大I=I1+I2=0.4+1.2=1.6(A)
如图所示的电路,R1=30Ω,R2=10Ω,开关S闭合后,电流表A的示数为0.4A, 求。。
1)U=I1*R1=0.4X30=12(V)2)I2=U/R2=12/10=1.2(A)3)R=R1/念手/R2=R1*
2)I2=U/R2=12/10=1.2(A)
3)R=R1/念手/R2=R1*R2/知高竖(R1+R2)=300/40=7.5(欧)
4)I=U/R=12/7.5=1.6(A)或搭大I=I1+I2=0.4+1.2=1.6(A)
2)I2=U/R2=12/10=1.2(A)
3)R=R1/念手/R2=R1*R2/知高竖(R1+R2)=300/40=7.5(欧)
4)I=U/R=12/7.5=1.6(A)或搭大I=I1+I2=0.4+1.2=1.6(A)