Physics calculator
Ohm's Law Calculator
Calculate resistance and power from voltage and current.
Formula
Ohm's law
Electrical calculations can involve safety risks. Verify wiring, ratings, and codes before practical work.
Resistance = voltage / current; power = voltage x current
12 V and 2 A gives 6 ohms and 24 W.
FAQs
What if current is zero?+
Resistance cannot be calculated from voltage divided by zero, so the calculator protects against that input.
Does this replace circuit design?+
No. It is a basic Ohm's law estimate for simple DC-style calculations.
How does the Ohm's Law Calculator calculate the result?+
It uses the Ohm's law: Resistance = voltage / current; power = voltage x current. 12 V and 2 A gives 6 ohms and 24 W.
What information do I need to use the Ohm's Law Calculator?+
Calculate resistance and power from voltage and current.
How accurate is the Ohm's Law Calculator?+
Ohm's Law Calculator applies the formula and assumptions shown on this page. Results may be rounded for readability, so verify changing rates, thresholds, medical guidance, or legal rules with the cited source or a qualified professional.
What should I check before using the Ohm's Law Calculator result?+
Check that the units, dates, rates, and assumptions match your situation. Change one input at a time to understand which values have the largest effect on the result.
Physics guide
How to use the Ohm's Law Calculator
Calculate resistance and power from voltage and current. The page also explains the ohm's law and shows a practical example: 12 V and 2 A gives 6 ohms and 24 W.
- 1
Enter your details
Enter voltage and current, then complete any other fields shown in the calculator.
- 2
Check the calculation
Review the result alongside the ohm's law: Resistance = voltage / current; power = voltage x current.
- 3
Compare scenarios
Change one or more inputs to see how they affect the ohm's Law Calculator result before you use the estimate.
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