Enter the Inductance (h), the change in current (amps), and the change in time (seconds) into the calculator to determine the Inductor Voltage. 

Inductor Voltage Formula

The following formula is used to calculate the Inductor Voltage.

VI = L * di / dt
  • Where VI is the Inductor Voltage (volts)
  • L is the Inductance (h) 
  • di is the change in current (amps) 
  • dt is the change in time (seconds) 

To calculate the inductor voltage, multiply the inductance by the change in current, then divide by the change in time.

How to Calculate Inductor Voltage?

The following example problems outline how to calculate Inductor Voltage.

Example Problem #1

  1. First, determine the Inductance (h). In this example, the Inductance (h) is determined to be 70 .
  2. Next, determine the change in current (amps). For this problem, the change in current (amps) is measured to be 14 .
  3. Next, determine the change in time (seconds). In this case, the change in time (seconds) is found to be 8.
  4. Finally, calculate the Inductor Voltage using the formula above: 

VI = L * di / dt

Inserting the values from above and solving the equation yields: 

VI = 70 * 14 / 8= 122.5 (volts)

Example Problem #2

Using the same method as above, determine the variables required by the equation. For this example problem, these are:

Inductance (h) = 94

change in current (amps) = 5

change in time (seconds) = 4

Enter these given values into the calculator or above yields: 

VI = 94 * 5 / 4 = 117.5 (volts)