Inductor Energy Calculator Formula
Understand the math behind the inductor energy calculator. Each variable explained with a worked example.
Formulas Used
Stored Energy
energy_mj = 0.5 * ind_h * pow(current_a, 2) * 1000Stored Energy (J)
energy_j = 0.5 * ind_h * pow(current_a, 2)Variables
| Variable | Description | Default |
|---|---|---|
inductance_mh | Inductance(mH) | 10 |
current_a | Current(A) | 1 |
ind_h | Derived value= inductance_mh / 1000 | calculated |
How It Works
Inductor Energy Storage
E = 0.5 x L x I^2
Energy is stored in the magnetic field. It scales with the square of current.
Worked Example
10 mH inductor carrying 1 A.
inductance_mh = 10current_a = 1
- 01L = 10 mH = 0.01 H
- 02E = 0.5 x 0.01 x 1^2 = 0.005 J = 5 mJ
Frequently Asked Questions
Where is the energy stored?
In the magnetic field surrounding the inductor coil.
What happens when current is interrupted?
The inductor generates a voltage spike (back-EMF) trying to maintain current flow. This can damage circuits without protection.
Inductor vs capacitor energy?
Capacitor: E=0.5CV^2 (electric field). Inductor: E=0.5LI^2 (magnetic field).
Ready to run the numbers?
Open Inductor Energy Calculator