Inductor Voltage Calculator

When current changes in a coil, it creates a voltage. That’s what we call Inductor Voltage. Our Inductor Voltage Calculator helps you find this voltage instantly using a simple formula. You’ll just enter a few values, and the calculator will do the rest.

This tool is made for students, engineers, and anyone curious about how inductors work. It’s fast, free, and accurate.

What is Inductor Voltage?

Inductor voltage is the voltage developed across an inductor when the current passing through it changes. Inductors resist any change in current, so they create a voltage to oppose it.

In simple terms, if current through a coil changes, a voltage appears across it. The faster the current changes, the higher the voltage.

Inductor Voltage Formula

The formula to calculate inductor voltage is:

VI = L × (di / dt)

Where:

VI = Inductor Voltage (volts)

L = Inductance (henries, H)

di = Change in current (amps)

dt = Change in time (seconds)

In plain words:

Multiply the inductance by the rate of change of current over time.

How to Use the Inductor Voltage Calculator

Using this calculator is a breeze. You’ll just need three values: inductance, change in current, and change in time.

1. Enter the inductance value (in H, mH, µH, or nH).
2. Enter the change in current (in A, mA, µA, or kA).
3. Enter the change in time (in s, ms, µs, ns, min, or h).
4. Choose your output unit (V, mV, µV, or kV).
5. Hit the “Calculate” button.

The calculator will instantly show the voltage and all steps used in the calculation.

Example Calculation

Let’s see how it works in real life.

Example 1:

L = 70 H

di = 14 A

dt = 8 s

Now apply the formula:

VI = L × (di / dt)

VI = 70 × (14 / 8)

VI = 122.5 volts

So, the inductor voltage is 122.5 V.

Example 2:

L = 94 H

di = 5 A

dt = 4 s

VI = 94 × (5 / 4)

VI = 117.5 volts

The inductor voltage here is 117.5 V.

Why Use This Calculator?

This online Inductor Voltage Calculator saves you time and removes the guesswork. You won’t need to worry about units or conversions. It does everything automatically.

You can use it for physics homework, lab experiments, or quick checks in electrical projects. Whether you’re a student or a hobbyist, you’ll love how simple it is.

Understanding the Concept

Think of an inductor like a spring. When current flows through it, energy is stored in its magnetic field. If you try to change that current quickly, it pushes back — just like a spring resists sudden changes. That pushback appears as induced voltage.

So, higher inductance or faster current change means more voltage.

Final Verdict

The Inductor Voltage Calculator is a handy online tool that makes electrical calculations effortless. It’s accurate, beginner-friendly, and explains every step clearly.

You’ll never have to struggle with inductor voltage problems again. Just plug in your values and get instant answers anytime, anywhere.

FAQs

What is the formula for inductor voltage?

The formula is VI = L × (di / dt).

What unit is used for inductance?

Inductance is measured in henries (H).

What happens if current doesn’t change?

If current is constant, di/dt = 0, so the inductor voltage is zero.

Can I use this calculator for AC circuits?

Yes, but it works best for steady or short-term changes in current.

Why is the voltage negative sometimes?

That’s due to Lenz’s Law — the induced voltage opposes the change in current direction.