Surface Current Density Converter
Surface current density measures electric current flowing per unit area of a conductor surface. Essential for skin effect analysis, antenna engineering, and PCB trace capacity calculations.
Common Surface Current Density Conversions
| From | To |
|---|---|
| 1 A/m² | 0.0001 A/cm² |
| 1 A/cm² | 10,000 A/m² |
| 1 kA/m² | 0.1 A/cm² |
| 1 mA/m² | 0.001 A/m² |
| 10 A/cm² | 100,000 A/m² |
| 1 MA/m² | 100 A/cm² |
Surface Current Density Unit Definitions
- A/m² (amperes/m²)
- SI unit of current density.
- A/cm²
- 10,000 A/m². Common in power electronics.
- kA/m²
- 1,000 A/m². High-current applications.
- mA/m²
- 0.001 A/m². Leakage currents and surface oxidation.
Frequently Asked Questions
What is the skin effect?
At high frequencies, current concentrates near the conductor surface. At 50 Hz in copper, skin depth ≈ 9 mm; at 1 MHz, ≈ 66 µm. Surface current density increases with frequency.
What is a safe current density for copper conductors?
Typical guideline: 3–6 A/mm² (3–6 MA/m²) for power wiring. PCB traces follow IPC-2221 tables based on width and temperature rise.
What is the difference between surface and volume current density?
Volume current density J (A/m²) applies to bulk conductors. Surface current density applies when current is confined to a thin surface layer, as in the skin effect.