#### Mechanical Equivalent of an Inductor is a Mass

The mechanical analog of an inductor is a*mass*. The voltage across an inductor corresponds to the force used to accelerate a mass . The current through in the inductor corresponds to the velocity of the mass. Thus, Eq.(E.4) corresponds to

*Newton's second law*for an ideal mass:

*acceleration*of the mass . From the defining equation for an inductor [Eq.(E.3)], we see that the stored magnetic flux in an inductor is analogous to mass times velocity, or

*momentum*. In other words, magnetic flux may be regarded as electric-charge momentum.

**Next Section:**

Butterworth Lowpass Poles and Zeros

**Previous Section:**

Mechanical Equivalent of a Capacitor is a Spring