Basically, the power supplies can be divided in three categories:
In the course of this article we will talk about direct current only, having already clearly ruled out the alternating one for our purposes. We may still notice the presence of the “~” symbol on the tag, but it is clearly referred to the power supply input that, obviously, must be connected to the alternating current network. On the left, on the contrary, the direct current model, in the line with the output values shows in an equally clear way +5 V 2A, moreover the symbol “═” graphically points to the direct current finally, in these power supplies, the voltage polarity is always indicated on the output JACK in this case the graphics represented on the tag indicates that the positive pole (+) is connected to the central part of the jack while the negative pole (-) is connected to the external part. In some cases, in the place of the AC abbreviation, the symbol “~” may be found, and it still means “alternating current”. In the alternating current model, shown on the right side of the figure, the line with the indications concerning the output says: AC 12 V 500mA 6VA, that respectively represent: alternating current, maximum output load and power, expressed in VA (that can always be obtained by means of the P = V*I formula). Comparison between power supplies operating on AC and DCĪs it can be noticed from the symbols found on the respective tags, it is quite simple to distinguish the two models, even though they are physically similar.
0 kommentar(er)
