So long story short, I'm in need for an on/off switch (latching push button) for a 5V/7A circuit. I've found some switches that would be ideal, but they are for 250V/1.5A, 125V/3A, or 12V/?A. Would these actually work for my purposes?
They should, try it.So long story short, I'm in need for an on/off switch (latching push button) for a 5V/7A circuit. I've found some switches that would be ideal, but they are for 250V/1.5A, 125V/3A, or 12V/?A. Would these actually work for my purposes?
7 ampers?
That must be wrong.
That is not your usual switch.
If you really run 7A through there you will probably end up melting/fusing the lower switch.
PS: sure any of them will work for a reduced time, but they will end up overheating and falling.
They should, try it.
these should work https://www.amazon.com/Support-Roun...e=UTF8&qid=1484241918&sr=8-14&keywords=Switch
a switch can handle power, not just amps or voltage... so 5V 7A, means almost any 250v switch would do fine... since if it can handle 250V at 1.5A a quick calculation would mean that 250/5=50, so 1.5A*50=75... this should mean the switch can handle 5V at 75AI'm trying to be fancy while consolizing a Neo Geo MV-1FZ, and the manual states that the 5V circuit uses 7A :S .
All right those look good, thank you.
Yeah that's kind of what I guessed, but I just wanted to be sure (having bags of useless parts lying around gets old fast )a switch can handle power, not just amps or voltage... so 5V 7A, means almost any 250v switch would do fine... since if it can handle 250V at 1.5A a quick calculation would mean that 250/5=50, so 1.5A*50=75... this should mean the switch can handle 5V at 75A
Actually that is not right.a switch can handle power, not just amps or voltage... so 5V 7A, means almost any 250v switch would do fine... since if it can handle 250V at 1.5A a quick calculation would mean that 250/5=50, so 1.5A*50=75... this should mean the switch can handle 5V at 75A
it's not one on one sure... the switch metal distance does doe for the the maximum current as do the thickness of the metal do for voltage... so if the switch devides the metals far enough from each other it's good enough for the amps (though i never seen 5vdc with 7 amps) almost all switches of 250 volts are good for 5v switching with whatever you've got... not all amps might travel over the switch in a circuit, so it's only the amps traveling over the switch that can hurt the switch... for burning in switch there's a solution, use a capasitor parallel to the switch (and recalculate the rest of the circuit for this mod might hurt the rest of the circuit...Actually that is not right.
A Switch must support a given voltage, for this is given better insulation and contacts that avoid sparks.
In the other hand a Switch must support current, and for this it is given lower resistence and heat dissipation characteristics.
A Switch only supports the power given by I^2*R, with R the resistence of the switch.
It never supports the full power (e.g. 250V*1.5A). The voltage drop in the switch is ideally 0V (and ideally it would dissipate 0W)
In real life, how much it dissipates depends on its resistance. And you should select a switch that supports the given current (for power dissipation requirements) and voltage (for insulation requirements).
Never calculating a constant V×I, that is not how it works.
Prepare for switch melting.
That is not how it works. Max volts depends on insulation as others said, and max amps depends on wire thickness. Reducing voltage won't magically make the wires thicker.a switch can handle power, not just amps or voltage... so 5V 7A, means almost any 250v switch would do fine... since if it can handle 250V at 1.5A a quick calculation would mean that 250/5=50, so 1.5A*50=75... this should mean the switch can handle 5V at 75A
as far as my middle tech school teached me and my books still teach, the stress a wire (as it is for a switch) can handle is is always in watts... the the same wire (taking it's one single wire of metal like copper) of 10v1a (or take a fuse to check) will handle 5v2a without any risks... then there is one big thing that i indeed didn't calculate: ac->dc is of cource not just the same... ac bring more stress for the wire's or switch as for what it's worth...That is not how it works. Max volts depends on insulation as others said, and max amps depends on wire thickness. Reducing voltage won't magically make the wires thicker.
@OP it may be safer to use a low power switch connected to a power delivery transistor, as if the switch fails, less power goes into the person flipping it.
The problem is in your interpretaron of what is that U in UxI.technician 24 when i was finished, low voltage electronics technician... now voltage hing amps (like 1.5 volt, 10 amps will do fine in small wires, it's the total of UxI voltage xcurrent that will turn in to heat... current itself is not heat as is voltage...
forget it, it's allright... it's getting useless anyway... though i'd learner P=UxI, UxR=I, and playing with random numbers we learnned that we could get rid of U by using P=i^2xR, so P=I^2XR was not really to check the heat though it would read that way, it was only to be able to backwards calculate U ideal in my books, not for an accurate P in watts... but you're right that about the detailes of the wire are not specifeid, and guessing is not really a thing to try when playing with power. so it's not necessary to drag the battle further... i take it i missed a few detailles at school.The problem is in your interpretaron of what is that U in UxI.
That U is not the line voltage, or the insulation voltage. That U is Uwire the voltage drop on the wire that is ideally 0 and in reality very small.
That Uwire is not specified in the switch characteristics.
Also: yes, dissipated power turns to heat and P=Uwire x I, that is P=I^2xR.
R, the resistence, decreases when you increase the wire width, so P is lower and it generates less heat. So making the wire wider makes it support more current.
Note that in that formula for power I use Uwire = IxR -> P=IxIxR.
That is Uwire, not Uline, don't mix then up!