What does RU (UR) label on DC power relays mean?
Apr 5, 2016 · The "Recognized Component Mark" is a type of quality mark issued by Underwriters Laboratories. It is placed on components which are intended to be part of a UL listed product, but which cannot bear the full UL logo themselves. [6] The general public does not ordinarily come across it, as it is borne on components which make up finished products.
What is the origin of on and off power switch symbol?
Oct 11, 2012 · According to him the off symbol "0" represents an uninterrupted electrical circuit (circle), that has electricity traveling from the power source through the wiring in a continuous loop Once a device's switch is turned on the electrical current flows, more or less, from the power source to the device in a straight line; which explains the "1 ...
pcb design - What do the PCB markings mean? - Electrical …
Jan 19, 2012 · 8. \$\begingroup\$. In addition to that, you will also find other markings on the PCB. These are done by the fab house and are used to show UL certification numbers, UL standards that the PCB conforms to, sometimes showing RoHS compliance, and sometimes even a logo of the fab house. These can be done in silkscreening process, or anti-soldermask ...
theory - Where does U for voltage come from? - Electrical …
The best reason I've heard is to avoid this: -. V = 2 V (which of course is meant to say "voltage = 2 volts") U = 2 V sounds more sensible after all we use a different symbol for current (I) and also amps. Voltage is a bit on its own - we wouldn't say "amps = 2 amps" or "current = 2 currents". It seems to me this is the sensible reason for ...
Meaning of symbol on LED screen price tag
Nov 25, 2012 · 5. I wanted to know the meaning of a particular globally-used standardized symbol printed on the price tag of every led screen. Here is the symbol: This means a guy named Larry Reynolds is trapped inside. It is a quality mark, certification mark, introduced by an American organization called Underwriters Laboratories.
coax - Coaxial cable terminology : how to read? - Electrical ...
May 6, 2020 · 1. I need to understand the nomenclature used for coaxial cable. For example: UT-085-SS-SS, or UT-085-SS, or UT-085-NbTi. As far as I understood, the number 085 here is the total diameter of the cable in inches (thus 0.085 inches of diameter). The SS-SS means that the material is Stainless-Steel.
switches - How to connect to a PCB an arcade push buttons that is …
Dec 21, 2022 · The following diagram explains the concept. The colored switches are the L/D/R/U directions, and the black switches are the intended DL/DR/UL/UR switches. The Arduino symbol is just there for illustration. The PCB I will be using doesn't have any analog pin, and I …
What determines the voltage rating of a cable, and why do some …
Oct 31, 2022 · Added: Some of the confusion can be elminated by the definition listed here.. U being the r.m.s value between any two phase conductors of a multicore cable or of a system of single core cables.
voltage - What is CV & CC in power supplies? - Electrical …
Jun 11, 2014 · 1. Constant current and constant voltage. – Samuel. Jun 11, 2014 at 7:56. Add a comment. 3 Answers. Sorted by: The load requires more current than the maximum you set. The load requires at most the maximum current you set.
5 Band resistors and correct orientation
Jul 5, 2014 · Keep your multimeter handy. For example, it looks like some of your resistors in the picture are marked as follows: red-red-black-orange-brown. If these are 1 percent resistors, the brown band, per the deductive logic, is the 5th, tolerance band. The first three numbers are the three digut value: 220 (red-red-black).