Ohm's Law Voltage Calculator
Find the voltage across a component from the current flowing through it and its resistance using V = I × R. Enter current and resistance to see…
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Find the voltage across a component from the current flowing through it and its resistance using V = I × R. Enter current and resistance to see voltage when you calculate.
Worked example
Example calculated from the starting values. Enter your own values and press Calculate to get your result.
With the default inputs (current = 2 A, resistance = 12 ohms), the results are: voltage 24.000 V.
Quick reference: current vs result
Reference table based on the example values; it is not your calculation result.
| Current (A) | Voltage |
|---|---|
| 1 | 12.000 V |
| 2 | 24.000 V |
| 4 | 48.000 V |
| 10 | 120.000 V |
| 20 | 240.000 V |
| 40 | 480.000 V |
Frequently asked questions
What formula does this calculator use?
Voltage = i × r. Variables: i = current in A, r = resistance in ohms.
What do I need to enter?
You need current (A), resistance (ohms). Results update as you type.
What is an example result?
With the default inputs (current = 2 A, resistance = 12 ohms), the results are: voltage 24.000 V.
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