12.52/163
R₁=6k ohm = 600 ohm
R₂=4k ohm = 400 ohm
I=3mA= 0,003A
U=R*I
R=R₁+R₂
R=600+400=1000 ohm
U=1000*0,003=3 V
AB:
U=R₁I
U=600*0,003=1,8V
CD:
U=R₂I
U=400*0,003=1,2V
12.53/163
R=R₁+R₂
U=60V
U₁=36V
I=3A
R=U/I
R=60/3=20 ohm
R₁=U₁/I
R₁=36/3=12 ohm
R₂= R - R1
R₂ = 20-12=8 ohm.
12.59/165
R1=1
R2=3
U=12
t=10
E=1,8V
P=U*I
E=I(R1+R2)
I=E/(R1+R2)
P=U*E/(R1+R2)
P=12*1,8/(1+3)
P=5,4 <= to jest w czasie sekundy
5,4*10s=54
12.65/167
I1=2A
R1=5
R2=20
U=U1=U2
U=R1*I1
U=5*2=10V
I2=U/R2
I2=10/20
I2=0,5
I=I1+I2
I=2+0,5=2,5 A
12.70/168
