Current Conversion Formulas
Complete formulas for converting between different electrical current units including amperes, milliamperes, kiloamperes, and microamperes.
⚡ Basic Current Unit Conversions
Standard Current Prefixes
Microamperes to Milliamperes
Example: 2,500 µA
2,500 µA = 2.5 mA
Milliamperes to Amperes
Example: 1,500 mA
1,500 mA = 1.5 A
Amperes to Kiloamperes
Example: 2,200 A
2,200 A = 2.2 kA
Current-Power Relationships
Ohm's Law
Example: 12V across 4Ω
In mA: 3 × 1000 = 3,000 mA
Current: 3 A or 3,000 mA
Power Formula
Example: 60W bulb at 120V
In mA: 0.5 × 1000 = 500 mA
Current: 0.5 A or 500 mA
🔌 Common Current Levels Reference
| Application | Current (A) | Alternative Units | Typical Voltage |
|---|---|---|---|
| LED (small) | 0.02 | 20 mA | 3.3V |
| Microcontroller | 0.05 | 50 mA | 3.3V |
| USB Device | 0.5 | 500 mA | 5V |
| Smartphone Charging | 2 | 2,000 mA | 5V |
| Household Circuit | 15 | 15,000 mA | 120V |
| Electric Vehicle | 50 | 0.05 kA | 400V |
| Industrial Motor | 200 | 0.2 kA | 480V |
🔺 Three-Phase Current Calculations
Line vs Phase Current
Star (Wye) Connection
Example: 10 A phase current
Phase current: 10 A (10,000 mA)
Line current: 10 A (10,000 mA)
Total current: 3 × 10 = 30 A
Line = Phase current
Delta Connection
Example: 10 A phase current
Phase current: 10 A (10,000 mA)
Line current:
In mA: 17,320 mA
Line = √3 × Phase current
Three-Phase Power Current
Current from Power
50 kW load, 480V, PF=0.85
In mA: 70,700 mA
Line current: 70.7 A
Motor Full Load Current
25 HP motor, 480V, η=92%, PF=0.85
In kA: 0.0285 kA
FLA: 28.5 A