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In a closed circuit connected in series, the current flow in any place in the circuit is the same. While the amount of voltage and the amount of resistance can vary. To determine the amount of voltage and the amount of electrical resistance in the series, can use the formula:

Vt = V1 + V2 + V3 + • • • • • • + Vn
Rt = R1 + R2 + R3 + • • • • • • + Rn
It = I1 = I2 = I3 = • • • • • • = In

Where:
- Vt = number of voltage
- Rt = total resistance
- It = number of flow
- V1, V2, V3 = voltage of each source
- R1, R2, R3 = resistance of each component
- I1, I2, I3 = flow through each channel
- Vn = voltage at the source n
- Rn = resistance at the n components
- In = current in the channel n

Sample question 1:
What is the amount of voltage and current generated in the installation of a series of three battery voltage and current are respectively 1.5 V and 1 A?
Completion:
Vt = V1 + V2 + V3 = 1.5 + 1.5 + 1.5 = 4.5 VOLTS
It = I1 = I2 = I3 = 1 A
The amount of voltage generated 4.5 VOLTS and the current is fixed at 1 A


Example question 2:
What is the amount of electrical resistance produced in the installation of a series of three electric load value of 4 Ω, 6 Ω, 8 Ω?
Completion:
Rt = R1 + R2 + R3 = 4 + 6 + 8 = 18 Ω
The number of generated electrical resistance of 18 Ω

Based on the above, it can be concluded that:
1. Amount of voltage from a power source connected to the series is the sum of each voltage
2. Amount of resistance from a number of electrical loads or electrical components are connected series is the sum of each resistance
3. Currents in a series circuit is the same in all parts of the circuit

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