In circuit analysis, the dot convention is a convention denoting the polarity of two mutually inductive components, such as windings on a transformer.
The polarity of the voltage across each inductor with respect to the dotted terminals is the same, as shown in the figure below. This assumes an ideal transformer with no leakage inductance, where the voltages across each winding are always proportional.
When the current increases in the direction from the dot to the inductor, then positive voltage is induced at the dots of all the coupled inductors (including the original inductor due to self inductance). Alternatively, when current increases in the direction from the inductor to the dot (or, equivalently, decreases from the dot to the inductor), negative voltage is induced at the dots.
If two mutually coupled inductors are in series, the dot convention can be used in the same manner as in case of transformers.
Read more about Dot Convention: Sinusoidal AC
Famous quotes containing the word convention:
“By convention there is color, by convention sweetness, by
convention bitterness, but in reality there are atoms and space.”
—Democritus (c. 460–400 B.C.)