Series Circuit Calculator — Calculate Resistance, Current, and Voltage in Series Circuits

Series Circuit Calculator

Calculate total resistance, current, and voltage drops in a series circuit. Input your voltage source and resistor values to get instant calculations for your electrical projects.

Step 1: Circuit Specifications

3

About Series Circuits

In a series circuit, the current is the same through all components. Total resistance is the sum of individual resistances, and voltage divides across resistors proportional to their resistance.

Step 2: Resistor Values

Add Another Resistor

Series Circuit Formulas

Total Resistance: Rtotal = R1 + R2 + … + Rn

Current: I = Vsource / Rtotal

Voltage Drop: Vn = I × Rn

Circuit Analysis Results

Summary
Resistor Analysis
Visualization

Total Circuit Resistance

30.0 Ω
3 resistors with 12V source
Circuit Current
0.4 A
Total Power
4.8 W
Source Voltage
12.0 V
Resistor Count
3

Resistor Voltage Drops

Resistor Resistance (Ω) Voltage Drop (V) Power (W)

Voltage Distribution Visualization

Circuit Analysis Formulas

Series Circuit Analysis

Ohm’s Law: V = I × R

Power Formula: P = V × I = I² × R = V² / R

Total Resistance: Rtotal = ΣRi

Voltage Division: Vn = Vtotal × (Rn / Rtotal)

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