Ohm's Law Calculator

Ohm's Law Calculator

What is Ohm's law & How do I use it?

Sometimes when we’re working on a circuit we need to calculate voltage, current, or resistance. We’re all familiar, or at least should be, with ohm’s law;

So, I is our current, V is our voltage and R is our resistance. 

  • So to calculate current, we take the voltage divided by resistance.
  • To calculate voltage we use current multiplied by resistance.
  • Finally, resistance is calculated with voltage divided by current.

But if you want to make sure you’ve got it right, it can be easier to use a calculator just like this one!

Simply enter two values into the fields above to find the third.