Odpowiedź:
E=12V
U1=2,5V
U2=3,5V
U3=4,2V
P1=P2=P3=0,8W
I1=P1/U1
I1=0,8W/2,5V=0,32A
UR1=E-U1=12V-2,5V=9,5V
R1=UR1/I1=9,5V/0,32A
R1=29,68Ω≈30Ω
I2=0,8W/3,5V=0,23A
UR2=12V-3,5V=8,5V
R2=UR2/I2=8,5V/0,23A
R2=36,95Ω≈37Ω
I3=0,8W/4,2V=0,19A
UR3=12V-4,2V=7,8V
R3=UR3/I3=7,8V/0,19A
R3=41,05Ω≈41Ω
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Odpowiedź:
E=12V
U1=2,5V
U2=3,5V
U3=4,2V
P1=P2=P3=0,8W
I1=P1/U1
I1=0,8W/2,5V=0,32A
UR1=E-U1=12V-2,5V=9,5V
R1=UR1/I1=9,5V/0,32A
R1=29,68Ω≈30Ω
I2=0,8W/3,5V=0,23A
UR2=12V-3,5V=8,5V
R2=UR2/I2=8,5V/0,23A
R2=36,95Ω≈37Ω
I3=0,8W/4,2V=0,19A
UR3=12V-4,2V=7,8V
R3=UR3/I3=7,8V/0,19A
R3=41,05Ω≈41Ω