Calcolatrice Densità di Corrente Gratuita
Calcola la densità di corrente da corrente e sezione del conduttore.
Current Density
4,000,000 A/m²
Current Density vs Current
Formula
Current Density
Current density describes how much current flows through a unit area of a conductor.
Formula
J = I / A
where I is the current and A is the cross-sectional area of the conductor. High current density causes excessive heating.
Esempio Risolto
10 A through a wire with 2.5 mm² cross-section.
- 01J = I / A
- 02J = 10 / 2.5 mm²
- 03J = 4 A/mm²
- 04J = 4,000,000 A/m²
Domande Frequenti
What is a safe current density for copper wire?
For continuous operation, copper wire should typically not exceed about 4 to 6 A/mm². Higher densities cause excessive heating.
Why does current density matter?
Current density determines resistive heating in the conductor. Exceeding safe limits can melt insulation or cause fires.
Is current density uniform across a wire?
At DC, yes. At high AC frequencies, the skin effect causes current to concentrate near the wire surface, increasing effective current density.
Impara