Ohm’s law
Find voltage from current and resistance.
Inputs
Use the units shown—
Enter your values and select Calculate.
Formula & explanation
V = I × R
Variables & units
- Current
- A · minimum 0
- Resistance
- Ω · minimum 0
Worked example
2 A through 12 Ω requires 24 V.
Assumptions
Applies to ideal ohmic components under constant physical conditions.
Formula version 1.0.0. JavaScript floating-point arithmetic applies. Results display up to 6 decimal places; stored values retain available precision. Use the units shown.
Practice with an example
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