Current Divider Calculator
Calculate branch currents when resistors are connected in parallel. Uses the current divider rule.
How It Works
Calculate branch currents when resistors are connected in parallel. Uses the current divider rule. Enter your values above and click Calculate to get instant results.
Formula
I1 = I_total × R2 / (R1 + R2) | I2 = I_total × R1 / (R1 + R2)
Quick Examples
- 100mA total, R1=100Ω, R2=200Ω → I1=66.7mA, I2=33.3mA
- 1A total, R1=R2=50Ω → I1=I2=0.5A
Frequently Asked Questions
What is the current divider rule?
In a parallel circuit, each branch carries a fraction of the total current inversely proportional to its resistance: I1 = I_total × R2/(R1+R2).
Why does the higher resistance get less current?
Current follows the path of least resistance. A lower resistance branch presents less opposition, so more current flows through it.