Inductors

Inductors store their energy in a magnetic field. The flux linkage $\lambda$ of an inductor coil is related to its current i by

$\begin{displaymath}\lambda = L i \end{displaymath}$

where L is the inductance. Since the voltage is given by $v = d\lambda/dt$ , we have

$\begin{displaymath}v = L \frac{di}{dt} . \end{displaymath}$

(18)

The sign convention is given in the Figure 21.

**Figure 21:** Inductor.
$\begin{figure} \begin{center} \epsfig{file=images/lcimg2.eps}\end{center}\end{figure}$

As usual, positive current enters the + terminal.

ANU Engineering - ENGN2211