Series:
Vt = V1 + V2 + V3
It = I1 = I2 = I3
Rt = R1 + R2 + R3
Parallel:
Vt = V1 = V2 = V3
It = I1 + I2 + I3
1/Rt = 1/R1 + 1/R2 + 1/R3
1. Three resistors of 25Ω, 45Ω, and 75Ω are connected in series. A current of 2.0 A runs through the first resistor.
2. Three resistors of 25Ω, 45Ω, and 75Ω are connected in parallel. A current of 2.0 A runs through the first resistor.
3. Three resistors of 9Ω, 36Ω, and 18Ω are connected in series. A 189V battery is used.