Inductors

Inductors use current through a coiled wire to store energy as a magnetic field. The energy is returned when applied current drops. Inductors develop a voltage that resists instantaneous changes in current.

The voltage is proportional to the change in current. This proportionality is called the inductance ($L[H]$), such that:

$$V=L\frac{dI}{dt}$$

This is analogous to Newton’s 2nd law: $V$ is a force pushing the current, which is opposed by $L$. A large mass (big $L$) accelerates less ($\frac{dI}{dt}$). A small mass ($L$) accelerates more.