Series Resistance Calculator
Add up to three resistors in series — the total is simply their sum.
Total resistance650.00Ω
In kilohms0.650kΩ
Resistors in series carry the same current, so their resistances simply add: R_total = R1 + R2 + R3. With 100 Ω, 220 Ω and 330 Ω in series the total is 100 + 220 + 330 = 650 Ω. Leave R3 at 0 to add only two resistors. Adding more resistors in series always increases the total.
Questions
How do resistors add in series?
Series resistances simply add together: R_total = R1 + R2 + R3. Three resistors of 100 Ω, 220 Ω and 330 Ω in series total 650 Ω.
Does adding a resistor in series increase or decrease resistance?
It always increases the total, because the same current must now pass through more resistance. The total can never be less than the largest single resistor.