Current from Power
Calculates electrical current from power (Watts) and voltage (Volts).
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Enter your data above to instantly see your analysis result.
Current from Power Calculator
Use this calculator to find electrical current from power and voltage in seconds. It supports both direct current (DC) and single-phase alternating current (AC 1-phase), so you can quickly estimate load current for power supplies, appliances, and small industrial devices.
How It Works
For DC, the tool uses:
I = P / U
For AC 1-phase, it includes power factor:
I = P / (U * cosφ)
Enter power and voltage, choose the system type, and for AC add the power factor. The result is shown in amperes (A), ready to use for cable sizing, breaker selection, or quick troubleshooting.
live_help Frequently Asked Questions (FAQ)
How do I use the calculator step by step?
Select the supply type in System, then enter values in Power (P) and Voltage (U). If you choose AC single-phase, also enter Power Factor (cosφ). The tool immediately shows the output under Calculated Current (I).
What is the difference between DC and AC single-phase modes?
In DC mode, current is computed from power and voltage directly. In AC single-phase mode, Power Factor (cosφ) is included, because real-world AC loads are not purely resistive. Selecting the correct mode in System is critical for accurate results.
What values should I enter for Power Factor (cosφ)?
For many practical AC loads, typical values are between 0.8 and 1.0. If your device datasheet provides a specific power factor, use that value. A lower power factor leads to higher calculated current for the same power.
Which units are expected in the inputs?
Use standard electrical units shown in the form: watts for Power (P) and volts for Voltage (U). The result in Calculated Current (I) is expressed in amperes.
Why does the result change a lot after switching mode?
Switching from DC to AC single-phase changes the formula by introducing Power Factor (cosφ). This is expected behavior and reflects real electrical system differences.
What should I verify if the value looks wrong?
Confirm the selected System, check that Power (P) and Voltage (U) use correct magnitudes, and verify Power Factor (cosφ) for AC calculations.