Circuit RL

How to use it

1. Inductance L = 0.5 H, Resistance R = 25 Ω
2. Time constant: Ï„ = L ÷ R = 0.÷ 25
3. Ï„ = 0.seconds (milliseconds)
4. Final current with 10V: I = ÷ 25 = 0.4 A

Common mistakes

• ⚠️ Confusing RL with RC time constant formule
• ⚠️ Not understanding that current reaches 63% in one time constant
• ⚠️ Forgetting that inductor opposes current change

Worked example

Calculate the time constant and Final current for an RL circuit with L=0.5 H and R=25 Ω.

The time constant {tau} s determines how fast current reaches Final value {current_final} A.

Input guide