Series Resistance Calculator
Add resistors in series and see the current and voltage across each one for a given supply voltage.
Your inputs
Results
Total resistance
650 Ω
- Series current
- 0.018462 A
✓Exact calculation — rounded only for display
| Resistor (Ω) | Voltage (V) |
|---|---|
| 100 | 1.846154 |
| 220 | 4.061538 |
| 330 | 6.092308 |
What this calculator does
In series, the same current flows through every resistor and their resistances add.
Formula and method
Worked example
Calculated by this tool with its default inputs:
Inputs
- Resistances (Ω): 100, 220, 330
- Supply voltage (optional, for the divider): 12
Results
- Total resistance: 650 Ω
- Series current: 0.018462 A
How to read the results
The voltage divides in proportion to each resistance.
Assumptions and limitations
- Ideal resistors assumed.
These are educational estimates. Electrical, structural and other safety-critical work must comply with local codes and be designed or checked by a qualified professional.
Questions
Is a voltage divider a series circuit?
Yes — the output is taken across one resistor of the series chain.
Methodology and verification
- Result type
- Exact mathematical calculation (rounded only for display)
- Formula version
- 1.0
- Automated verification
- 2 reference and validation test cases, checked against independently computed values. The site cannot be built if any of them fail.
- Editorial review
- Awaiting human editorial review. The explanation was drafted with AI assistance; the formula and examples are verified by the automated tests above.
Privacy
Everything you enter is calculated in this browser and is not sent to Numerith or anyone else. Inputs are added to a share link only if you choose to include them. Privacy policy