What exactly is voltage? - Electrical Engineering Stack Exchange
The total voltage you get from one out and back, even with a high temperature difference is pretty small. By putting many of these out and back combinations together, you can get a useful voltage. A single …
What, exactly, is voltage? - Electrical Engineering Stack Exchange
Aug 22, 2020 · And also if voltage is like gravitational potential energy, how does more voltage mean more current? And here our nice analogy breaks down. In this sense voltage is more like pressure in …
Does LED brightness change with voltage?
Sep 6, 2016 · The voltage only needs to be slightly above the forward voltage rating of the LED. A common way to control brightness is through pulse width modulation (PWM). Instead of giving a LED …
Voltage across Vce in a common emitter BJT
Sep 15, 2025 · In this case, the voltage across the current source I depends only on R. With other words: The voltage across a constant current source depends on the external network only. …
How much voltage/current is "dangerous"? - Electrical Engineering …
Likewise, if the current and voltage are below a certain level, a person can--given enough time--safely absorb an arbitrarily large amount of electrical energy. Further, if voltage is sufficiently low, the …
How to calculate voltage drop over and power loss in wires
How do I calculate the voltage drop over wires given a supply voltage and a current? How do I anticipate on voltage drop so that the final load has the correct supply voltage? What will be the power
LED forward current vs forward voltage - Electrical Engineering Stack ...
May 5, 2022 · I am trying to make a simple circuit for a nametag for kids to solder at a workshop. The LED I was planning to use is 151033BS03000 it has a graph of forward current vs forward voltage. …
How to reduce DC voltage using resistors?
Jul 10, 2013 · How would one go about using a 12 V DC power source to power something which needs 4.5 V DC using resistors? Is there a way to determine how much adding a resistor would drop the …
Three phase power supply - what is line to line voltage
Dec 4, 2013 · 2 Line to line voltage for a 3phase network (120deg separation) is sqrt (3)*phase voltage. So for a 230V 3ph network the line-line is 400V
How is it possible to have high voltage and low current? It seems to ...
Feb 4, 2015 · 7 One word: Resistance. Recall that Voltage is calculated by multiplying the current by the resistance. You can have a high potential difference (which is what voltage is), and a low current, …