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Online Calculator
Ohm's law calculator
Select the quantity you want to calculate and enter the other two.
Voltage
12 V
Information
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Frequently asked questions
What's Ohm's law?
Relate voltage, current, and resistance using V = I × R.
Can I calculate current?
Yes. I = V ÷ R.
Can I calculate resistance?
Yes. R = V ÷ I.
What happens when dividing by zero?
The calculator does not show a valid numerical result.