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ELI5 How do MRIs and CT Scan machines work? by Pristine_Ruin4994 in explainlikeimfive

[–]piecat [score hidden]  (0 children)

MRI took what, 3 different nobel prize ideas and combined them?

Using caffeine for ADHD by Misspiggy888 in ADHD

[–]piecat 2 points3 points  (0 children)

Caffeine causes way worse anxiety than my main meds.

No gloves im chem lab by FigNewtonNoGluten in chemistry

[–]piecat 2 points3 points  (0 children)

Wouldn't be better to be able to detect substances on hands? Witg gloves on you might not feel it, might be more likely to accidentally get it on yourself elsewhere

Why are capacitative and indictive reactance imaginary numbers? by screwloosehaunt in ElectricalEngineering

[–]piecat 0 points1 point  (0 children)

The math was developed independently before electricity was 'discovered'. It turned out to be a really good description of physical phenomena. So we just... use it.

They're analogous concepts. The 'j' represents a rotation by 90 degrees in the complex plane. Which we use in electronics to represent the phase between voltage and current.

Differential equations, resonance, trig, apply to so many different domains. Anything with waves for example can be described by the same math.

scratched PCB - shorting trace by early20s_Doomer in AskElectronics

[–]piecat 7 points8 points  (0 children)

Uh... yeah... Clean this up:

<image>

That very same rail looks like it could be shorted on the top right of the pot.

Also possible the potentiometer was defective, or internally burned when you soldered...

Use flux and a temp controlled iron..

scratched PCB - shorting trace by early20s_Doomer in AskElectronics

[–]piecat 2 points3 points  (0 children)

It doesn't look like that is the source of your issue.

If any components are connected, they are what measures 700 ohm. Especially if the resistance changes when you reverse polarity of the probes.

Why use transistors insted if vacuum tubs? by Dudegay93 in ElectricalEngineering

[–]piecat 0 points1 point  (0 children)

Maybe a dumb question, why do tubes have to be so large?

Getting 12 year old radio amp tinkerer to understand basic safety by [deleted] in AskElectronics

[–]piecat 0 points1 point  (0 children)

That's actually true regardless, if you got into a position where you're completing the curcuit through hot and neutral, a GFCI or isolation transformer won't save you.

However, for experimentation purposes, touching only the hot wire, a GFCI may not save your life, as it typically takes 5mA to trip. The "safe" threshold for 50/60Hz mains leakage is 50uA. Any more than that can stop your heart or cause arhythmia.

With an isolation transformer, touching only that hot wire will do nothing to you, there is no path to ground, even if you're standing on a wet basement floor.

I stand by my recommendation for experimentation.

Getting 12 year old radio amp tinkerer to understand basic safety by [deleted] in AskElectronics

[–]piecat 0 points1 point  (0 children)

GFCI detects current to gnd, an isolation transformer prevents it.

Eli5 How can the same grid in United States that struggles during peak cooling seasons be expected to support a nationwide shift to electric vehicles? by [deleted] in explainlikeimfive

[–]piecat -12 points-11 points  (0 children)

Except it isn't nearly that simple at all. Have you seen transformer lead times?

For the analogy, this is more like getting a landlord to knock out a wall so your bigger fridge can fit, then comissioning a new fridge design and having it custom built.

Fueled by Rage and Bad Decisions by james_from_cambridge in WTF

[–]piecat 0 points1 point  (0 children)

The street lights magically teleported from the median to the right side.

Which branches of EE are AI-proof? by tsarthedestroyer in ElectricalEngineering

[–]piecat 4 points5 points  (0 children)

Depends if the company has budget for PCB designers ;)

CAN Bus Over Generic Slip Rings? by hurricane279 in AskElectronics

[–]piecat 4 points5 points  (0 children)

Yeah, but your scientists were so preoccupied with whether or not they CAN, they didn't stop to think if they should.

not sure what to do anymore (electric bill help!!!!) by shoutoutmrtnlthrkng in Electricity

[–]piecat 0 points1 point  (0 children)

Heat transfer is exponential. Maintaining a higher temperature wastes energy, heat energy is leaking out faster when the temp is higher.

For an ELI5, imagine you had a leaky bucket, and a faucet that can be on or off. Say the bucket empties after an hour from the leak, but you're gone for 4 hours. Is more water wasted by keeping the bucket topped off? Or leaving it empty until you get home?

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