Using a non-contact voltage tester is the quickest and easiest way to safely check for electrical current in a wire ... a fussy sensitivity dial. An LED bar graph at the side of the tool indicates ...

To calculate the resistance of the series resistor required, we need to look at the current and voltage values recommended by the LED manufacturer. Suppose a manufacturer recommends a maximum ...

Almost every wall power supply has no indicator showing whether current is consumed ... were only places for the transistor, LED, and resistors on the board, not the elements themselves. It’s easy to ...

You should be able to recognise the graph of current against voltage for a diode. The diode has a very high resistance in one direction. This means that current can only flow in the other direction.

In his video [Afroman] describes how the LM317 can be used to regulate current rather than voltage to provide a constant ... may not be as efficient as an LED driver module or a switching solution ...

In 1929, Losev published detailed measurements of LED spectra and clearly observed their dependence on current 8. It is incredibly interesting to see this data now, with the hindsight that the ...