Ohm’s Law Calculator for High Voltage Testing

Ohm’s Law Calculator for High Voltage Testing

Ohm’s Law can be applied to the electrical behavior of conductors and insulation. High voltage test specifications often list a test voltage and either a maximum current or a minimum resistance. This calculator is designed to help you convert test specifications from voltage/current to voltage/resistance using Ohm’s Law.

Voltage (V)  V = I x R

Current (I)  I = V / R

Resistance (R)  R = V / I

Calculation Result

____ will cause
____ to flow through
(The power dissapated in the resistance is ____)

In an insulation resistance test: At ___ the resistance needs to be higher than ___ or the test will fail because the current will be larger than ___.


Calculations you've done so far:



  1. Enter your test voltage,
  2. Enter either the maximum leakage current or the minimum insulation resistance,
  3. Click “Calculate”
  4. The third value will be displayed in the Calculation Result section

Note: This general-purpose calculator can generate combinations of voltage and current that are not practical in normal cable testing applications. If the calculation shows voltages or currents out of the specified range for a cable tester, then you know the tester doesn’t measure the resistance with the current or voltage you’ve selected.


Ohm’s Law describes one possible relationship between voltage and current. The law is expressed mathematically as:

V = I * R I = V / R R = V / I

Where V is voltage, I is current, and R is resistance. Ohm’s Law says the voltage across a resistance is proportional to the current flowing through that resistance.