In order to understand the correct situation in which to use the word affect or effect, the first thing one must do is have a clear understanding of what each word means. 1  Affect is usually used as a verb. It is an action word that means to produce a change in or influence something. 2  Effect is usually used as a noun.
Shear Factor. The distance a point moves due to shear divided by the perpendicular distance of a point from the invariant line.
Another term that is useful in this discussion is power factor (PF). The power factor is defined as the ratio of W to VA: Power factor = PF = W/VA (5) Power factor is always a number between zero and one because the watts drawn by a device are always less than or equal to the volt-amperes.