Inductor Voltage Spike Calculator

Reviewed By: Patrick Myers (BSME)

Enter the inductance, change in current, and change in time into the calculator to determine the inductor voltage spike.

Related Calculators

Inductor Voltage Spike Formula

The following formula is used to calculate the inductor voltage spike for a given inductance, change in current, and change in time.

V = L * (Delta I / Delta t)

Variables:

V is the inductor voltage spike
L is the inductance in henries (H)
ΔI is the change in current in amperes (A)
Δt is the change in time in seconds (s)

To calculate the inductor voltage spike, multiply the inductance by the change in current divided by the change in time. This will give you the voltage spike across the inductor.

What is an Inductor Voltage Spike?

An inductor voltage spike, also known as inductive kickback, occurs when the current flowing through an inductor is suddenly interrupted. This sudden change in current causes a large voltage to be generated across the inductor, which can potentially damage electronic components if not properly managed. Inductor voltage spikes are a common phenomenon in circuits involving inductive loads such as motors, transformers, and solenoids. Proper circuit design, including the use of flyback diodes and snubber circuits, can help mitigate the effects of these voltage spikes.

How to Calculate Inductor Voltage Spike?

The following steps outline how to calculate the Inductor Voltage Spike.

First, determine the inductance (L) in henries.
Next, determine the change in current (ΔI) in amperes.
Next, determine the change in time (Δt) in seconds.
Finally, calculate the inductor voltage spike using the formula V = L * (ΔI / Δt).
After inserting the values and calculating the result, check your answer with the calculator above.

Example Problem :

Use the following variables as an example problem to test your knowledge.

Inductance (L) = 0.5 H

Change in Current (ΔI) = 2 A

Change in Time (Δt) = 0.01 s