Ohm’s Law Calculator
Solve voltage, current or resistance for an ideal DC resistor. Supply the other two quantities and also see the calculated power.
- Free
- No sign-up
- Runs in your browser
Someone shared this result with you. It was made with Ohm’s Law Calculator, free on VISU, no sign-up.
Result
Enter the required values to see your result. Use the example to try the complete calculation.
Use positive DC magnitudes in volts, amperes and ohms. This ideal-resistor model does not handle AC impedance, component ratings or electrical installation safety.
How this calculation works
Ohm’s Law Calculator
Solve voltage, current or resistance for an ideal DC resistor. Supply the other two quantities and also see the calculated power.
Units and limits
Use positive DC magnitudes in volts, amperes and ohms. This ideal-resistor model does not handle AC impedance, component ratings or electrical installation safety.
Formulas
- Calculation
- V = I × R; P = V × I
Give your project a place to be found
Use VISU Link to bring your project links together on one page. This calculator remains free and works without an account.
Discover VISU LinkHow to use it
- Choose the operation when available and enter your own values in the labelled fields.
- Check the units and the limits explained below before interpreting the answer.
- Read the result and its details. Copy it or download a result card; no account is required.
Examples
Worked example
12 V across 6 Ω gives 2 A and 24 W.
Another case
0.5 A through 100 Ω requires 50 V and dissipates 25 W.
Add this tool to your site
Put this tool on your blog, store or club site. It runs inside your page, free, with no account, and a small "by VISU" credit line under it.
Questions
What does this tool calculate?
Solve voltage, current or resistance for an ideal DC resistor. Supply the other two quantities and also see the calculated power.
Which inputs and units should I use?
Use positive DC magnitudes in volts, amperes and ohms. This ideal-resistor model does not handle AC impedance, component ratings or electrical installation safety.
Can I check a worked example?
12 V across 6 Ω gives 2 A and 24 W.
Are my input values uploaded or stored?
No. The calculation runs in this browser. Typed values are not sent to analytics, placed in the page URL or saved by the calculator. Copying or downloading is an action you choose.
Do I need an account or a paid plan?
No. The calculation, example, result copy and result card are available without registration. VISU services are an optional next step.