Coil Current Report¶
The ExcitationCoilCurrentReport returns the electric current flowing
through the coil in response to an applied voltage or an applied current (in
which case it just returns the applied current).
When a voltage is applied across a coil, an electric current flows through it depending on the coil’s resistance and the back electromotive force induced by the changing magnetic field.
\[
I = \frac{1}{R} \left(
V - \int_\Omega \frac{\partial \mathbf{A}}{\partial t} \cdot \mathbf{\tau}
d\Omega
\right)
\]
where \(I\) [A] is the resulting current, \(V\) [V] is the applied voltage, \(R\) [\(\Omega\)] is the coil resistance. The second term is the back electromotive force.