What is the Current Calculator?
The current calculator is a free online tool that helps you work out current quickly and accurately. It uses the standard formula V = I x R; P = V x I (leave the unknown as 0) and shows the result instantly as you type, along with a full breakdown so you can see exactly how the answer was reached.
How to use this calculator
- Enter any two of voltage, current and resistance.
- Leave the unknown as 0.
- See all values and power.
Formula used
V = I x R; P = V x I (leave the unknown as 0)Explanation of each input
- Voltage (V) (V) โ the voltage (v) used in the calculation.
- Current (I) (A) โ the current (i) used in the calculation.
- Resistance (R) (ohm) โ the resistance (r) used in the calculation.
Understanding your result
- Voltage โ the calculated voltage in V.
- Current โ the calculated current in A.
- Resistance โ the calculated resistance in ohm.
- Power โ the calculated power in W.
Step-by-step calculation
For the example values I=2A, R=5ohm:
- Apply the formula:
V = I x R; P = V x I (leave the unknown as 0) - Substitute the values: V=2x5
- Result: V=10V, P=20W
Worked example
| Inputs | I=2A, R=5ohm |
|---|---|
| Working | V=2x5 |
| Result | V=10V, P=20W |
Benefits and practical uses
This calculator saves you time and reduces errors when you need current. It is useful for students, professionals and anyone who wants a fast, reliable answer without manual calculation. Results update instantly, work in your browser and can be copied or shared in one click.
Assumptions and limitations
- Ideal resistive (DC) circuit.
Frequently asked questions
What is Ohm's law?
Voltage equals current times resistance (V = IR).
Disclaimer: Results are provided for general information. Please verify important figures independently.