Tabella delle unità in elettrodinamica

Ragionare in termini di unità di misura spesso può aiutare a risolvere molti dubbi nella soluzione dei problemi. Qui una tabella delle unità fondamentali in elettrodinamica.

Simbolo	Grandezza	Unità	Nome unità	Uguaglianza con altre unità di elettrodinamica	Uguaglianza con le unità del Sistema Internazionale
$Q,q$$Q,q$	Carica elettrica	${\text{C}}$${\text{C}}$	coulomb	${\text{A}}\,{\text{s}}={\frac {{\text{N}}\,{\text{m}}}{\text{V}}}$${\text{A}}\,{\text{s}}={\frac {{\text{N}}\,{\text{m}}}{\text{V}}}$	${\text{A}}\,{\text{s}}$${\text{A}}\,{\text{s}}$
$I$$I$	Corrente elettrica	${\text{A}}$${\text{A}}$	ampere	${\frac {\text{C}}{\text{s}}}$${\frac {\text{C}}{\text{s}}}$	${\text{A}}$${\text{A}}$
$\mathbf {J}$$\mathbf{J}$	Densità di corrente elettrica	${\text{A}}\,{\text{m}}^{2}$${\text{A}}\,{\text{m}}^{2}$	ampere al metro quadro	${\frac {{\text{C}}\,{\text{m}}^{2}}{\text{s}}}$${\frac {{\text{C}}\,{\text{m}}^{2}}{\text{s}}}$	${\text{A}}\,{\text{m}}^{2}$${\text{A}}\,{\text{m}}^{2}$
$\mathbf {E}$$\mathbf{E}$	Campo elettrico	${\frac {\text{V}}{\text{m}}}$${\frac {\text{V}}{\text{m}}}$	volt su metro	${\frac {\text{N}}{\text{C}}}$${\frac {\text{N}}{\text{C}}}$	${\frac {\text{N}}{{\text{A}}{\text{s}}}}={\frac {{\text{kg}}\,{\text{m}}}{{\text{A}}\,{\text{s}}^{3}}}$${\frac {\text{N}}{{\text{A}}{\text{s}}}}={\frac {{\text{kg}}\,{\text{m}}}{{\text{A}}\,{\text{s}}^{3}}}$
$V$$V$	Potenziale elettrico	${\text{V}}$${\text{V}}$	volt	${\frac {\text{C}}{\text{Fd}}}$${\frac {\text{C}}{\text{Fd}}}$	${\frac {{\text{N}}\,{\text{m}}}{{\text{A}}\,{\text{s}}}}={\frac {{\text{kg}}\,{\text{m}}^{2}}{{\text{A}}\,{\text{s}}^{3}}}$${\frac {{\text{N}}\,{\text{m}}}{{\text{A}}\,{\text{s}}}}={\frac {{\text{kg}}\,{\text{m}}^{2}}{{\text{A}}\,{\text{s}}^{3}}}$
$C$$C$	Capacità	${\text{Fd}}$${\text{Fd}}$	farad	${\frac {\text{C}}{\text{V}}}$${\frac {\text{C}}{\text{V}}}$	${\frac {{\text{A}}^{2}\,{\text{s}}^{2}}{\text{N}}}={\frac {{\text{A}}^{2}\,{\text{s}}^{4}}{{\text{kg}}\,{\text{m}}}}$${\frac {{\text{A}}^{2}\,{\text{s}}^{2}}{\text{N}}}={\frac {{\text{A}}^{2}\,{\text{s}}^{4}}{{\text{kg}}\,{\text{m}}}}$
$R$$R$	Resistenza	$\Omega$$\Omega$	ohm	${\frac {\text{V}}{\text{A}}}$${\frac {\text{V}}{\text{A}}}$	${\frac {\text{N}}{\text{s}}}={\frac {{\text{kg}}\,{\text{m}}}{{\text{s}}^{3}}}$${\frac {\text{N}}{\text{s}}}={\frac {{\text{kg}}\,{\text{m}}}{{\text{s}}^{3}}}$
$\mathbf {P}$$\mathbf {P}$	Polarizzazione elettrica	${\frac {\text{C}}{{\text{m}}^{2}}}$${\frac {\text{C}}{{\text{m}}^{2}}}$	coulomb su metro quadro	$-$$-$	${\frac {{\text{A}}\,{\text{s}}}{{\text{m}}^{2}}}$${\frac {{\text{A}}\,{\text{s}}}{{\text{m}}^{2}}}$
$\mathbf {D}$$\mathbf{D}$	Campo di spostamento elettrico	${\frac {\text{C}}{{\text{m}}^{2}}}$${\frac {\text{C}}{{\text{m}}^{2}}}$	coulomb su metro quadro	$-$$-$	${\frac {{\text{A}}\,{\text{s}}}{{\text{m}}^{2}}}$${\frac {{\text{A}}\,{\text{s}}}{{\text{m}}^{2}}}$
$\mathbf {B}$$\mathbf{B}$	Campo d'induzione magnetica	${\text{T}}$${\text{T}}$	tesla	${\frac {\text{Wb}}{{\text{m}}^{2}}}$${\frac {\text{Wb}}{{\text{m}}^{2}}}$	${\frac {\text{N}}{{\text{A}}\,{\text{m}}}}={\frac {\text{kg}}{{\text{A}}\,{\text{s}}^{2}}}$${\frac {\text{N}}{{\text{A}}\,{\text{m}}}}={\frac {\text{kg}}{{\text{A}}\,{\text{s}}^{2}}}$
$\Phi (\mathbf {B} )$$\Phi (\mathbf {B} )$	Flusso del campo magnetico	${\text{Wb}}$${\text{Wb}}$	weber	${\text{T}}\,{\text{m}}^{2}={\frac {\text{V}}{\text{s}}}$${\text{T}}\,{\text{m}}^{2}={\frac {\text{V}}{\text{s}}}$	${\frac {{\text{kg}}\,{\text{m}}^{2}}{{\text{A}}\,{\text{s}}^{2}}}$${\frac {{\text{kg}}\,{\text{m}}^{2}}{{\text{A}}\,{\text{s}}^{2}}}$
$\mathbf {A}$$\mathbf{A}$	Potenziale vettore	${\frac {\text{T}}{\text{m}}}$${\frac {\text{T}}{\text{m}}}$	tesla su metro	${\frac {\text{Wb}}{{\text{m}}^{3}}}$${\frac {\text{Wb}}{{\text{m}}^{3}}}$	${\frac {\text{kg}}{{\text{m}}\,{\text{A}}\,{\text{s}}^{2}}}$${\frac {\text{kg}}{{\text{m}}\,{\text{A}}\,{\text{s}}^{2}}}$
$\mathbf {M}$$\mathbf {M}$	Polarizzazione magnetica, magnetizzazione	${\frac {\text{A}}{\text{m}}}$${\frac {\text{A}}{\text{m}}}$	ampere su metro	$-$$-$	${\frac {\text{A}}{\text{m}}}$${\frac {\text{A}}{\text{m}}}$
$\mathbf {H}$$\mathbf {H}$	Campo magnetico	${\frac {{\text{A}}_{\text{s}}}{\text{m}}}$${\frac {{\text{A}}_{\text{s}}}{\text{m}}}$	ampere-spira su metro	$-$$-$	${\frac {\text{A}}{\text{m}}}$${\frac {\text{A}}{\text{m}}}$
$R$$R$	Riluttanza	${\text{H}}^{-1}$${\text{H}}^{-1}$	henry alla meno uno	${\frac {\text{A}}{\text{Wb}}}={\frac {1}{\Omega \,{\text{s}}}}$${\frac {\text{A}}{\text{Wb}}}={\frac {1}{\Omega \,{\text{s}}}}$	${\frac {{\text{A}}^{2}\,{\text{s}}^{2}}{{\text{kg}}\,{\text{m}}^{2}}}$${\frac {{\text{A}}^{2}\,{\text{s}}^{2}}{{\text{kg}}\,{\text{m}}^{2}}}$
$L$$L$	Induttanza, coefficiente di autoinduzione	${\text{H}}$${\text{H}}$	henry	${\frac {\text{Wb}}{\text{A}}}=\Omega \,{\text{s}}$${\frac {\text{Wb}}{\text{A}}}=\Omega \,{\text{s}}$	${\frac {{\text{kg}}^{2}\,{\text{m}}^{2}}{{\text{A}}^{2}\,{\text{s}}^{2}}}$${\frac {{\text{kg}}^{2}\,{\text{m}}^{2}}{{\text{A}}^{2}\,{\text{s}}^{2}}}$
$M$$M$	Coefficiente di mutua induzione	${\text{H}}$${\text{H}}$	henry	${\frac {\text{Wb}}{\text{A}}}=\Omega \,{\text{s}}$${\frac {\text{Wb}}{\text{A}}}=\Omega \,{\text{s}}$	${\frac {{\text{kg}}^{2}\,{\text{m}}^{2}}{{\text{A}}^{2}\,{\text{s}}^{2}}}$${\frac {{\text{kg}}^{2}\,{\text{m}}^{2}}{{\text{A}}^{2}\,{\text{s}}^{2}}}$