230 W, 230 V
I = 1 A.
Current from Power and Voltage
Enter power P and voltage U (U ≠ 0). You get current I.
Power: P = U·I. Voltage from power: U = P/I.
Result
Enter values. The result shows up here.
How it works
How to use
- Enter power P in watts.
- Enter voltage U ≠ 0.
- Read I = P/U.
Formula
I = P / U
U ≠ 0.
Real-life examples
460 W, 230 V
I = 2 A.
60 W, 12 V
I = 5 A.
6 W, 5 V
I = 1.2 A.
100 W, 50 V
I = 2 A.
2300 W, 230 V
I = 10 A.
0.1 W, 5 V
LED: I = 0.02 A.
120 W, 24 V
I = 5 A.
1000 W, 250 V
I = 4 A.
3.7 W, 3.7 V
I = 1 A.
Ways to use this calculator
- Current drawn by a device at known power.
- Check a fuse rating.
Frequently asked questions
Where does I = P/U come from?
From P = U·I divided by U.
What if U = 0?
We reject it: division by zero.
Where is P = U·I?
How do I get U?
Efficiency?
η.
Units?
W, V, result A.
Ohm's law?
U = I·R after you find I.
Large powers?
Enter watts, e.g. 2.3 kW → 2300 W.
Negative P?
With negative P the current can be negative too.