I'm wanting to polish my #embedded skills, but I want to make sure I don't miss critical areas. The main focus I want to make sure I'm good at atm is #PCB design and relevant #electrical eng.
I highly prefer thorough online articles, but books are also fine. I prefer avoiding YT videos because I do lots of back tracking to reinforce understanding.
These insidious little pests eat the protective earths from electrical installations, plugs and devices. Copper and plastic sheathing both disappear without a trace, as if they were never there.
These dangerous insects are very common around here. Sometimes even the shops selling electrical installation materials are infected and replacement plugs on shelves are entirely missing their PE pins.
Here is a curious finding from our statistical analysis https://arxiv.org/abs/2403.16217 :
A #Feynmangraph is a graphical short hand notation for a complicated integral that computes the probability for scattering processes in #quantum field theory.
An electrical circuit can also be described as a graph. What happens if we interpret the Feynman graph as an #electrical network, where each edge is a 1 Ohm resistor? We can then compute the resistance between any pair of vertices and collect all these values in a "resistance matrix", as shown below. The average of all these resistances is called "Kirchhoff index". Now it turns out that this average resistance is correlated fairly strongly with the Feynman integral of that graph: A graph with large contribution to quantum scattering amplitudes on average also has a large electrical resistance. Isn't that a nice connection between two seemingly distinct branches of theoretical #physics ?
I have 2 lights in my living room.
When both lights are off, the switch rockers are not in the same position, whic is very frustrating.
When I look at the wiring I am so confused.
Things to note in the photos - those two black cables going into a separate little block.
WTF is going on here?
There are no other lights or switches involved - it's not a "stair light" setup.
Can anyone help? I’m looking for something that electrically behaves like a regular #usb wall wart - 120Vac (I’m in the US) input, and 5V USB-A female output.
But, rather than it plugging into a receptacle, I want screw terminals for the AC input, similar to a bunch of the #sonoff devices - Basic, Mini, etc.
I have a bunch of places where I have AC wires available but need to power an ESP device. Wiring in a receptacle just for a single wall wart seems excessive.
The Vanguard community centre for the #blind.
We are supporting them this week with the supply and installation of a new #electrical catering #water#heater.
This will be totally #free, and it will help them to provide a more comfortable service for their many users and #volunteers/#staff.
Working together with cross agencies to support the #public.
Because my current #geeketry requires actual real world shit, today I shall also be attempting to port this spaghetti over to this new #lightswitch. I shall either blow myself up, blow the house up or manage it just fine and prove that I'm the king #electrician. What is nice though, you see that blue wire? This is the first switch I'm replacing in my house that has a neutral available! 🥹
After an unexpected fireworks display in the studio this evening I dismantled the plug on the 6-way extension power cord.
The neutral (blue) wire was charred and melted almost through to the earth (yellow/green) wire.
No high-current loads attached so I’m guessing a loose screw on the neutral pin 🤔😳
This is one of the few ways that the UK standard power plug can fail.
» #neuroscience has become so broad & technically sophisticated that individual researchers can no longer fully understand the technical foundations of their experiments.
The hall light fixture hasn't worked in a while. I detached it from the ceiling but was left with only 3" clearance between the dangling fixture & the ceiling. Cramming my hands & neck to see & reach in there was almost impossible. I don't know how men with their larger hands, work within those bloody tiny electrical boxes.
Finally found & replaced the faulty (melted) wire. What a struggle!
I had to cross brace the long mounting plate that is meant to bridge the hole & hang the fixture from. Like all electrical things it was too damn small and kept pushing up into the hole.
I had to find a tiny 1" screwdriver to fit up in there when replacing that thing.
Good grief 2 hours of contorted torture. Not to mention holding your arms & tools above your head the entire time. 🥵
Oooh, love Wago connectors (for house wiring). Used some for a project for the first time, SOOO much better (and more secure) than the old twist-on-wiring caps. #electrical#wiring
The last couple days have been a #handywork bonanza of little projects including some nice wins that I'm quite proud of.
I replaced a broken fluorescent light fixture in the laundry room with a standard bulb with a plug in the fixture (which will get an LED work light strip soon).
And I forcefully removed, cleaned, greased & replaced a bathroom faucet handle that became so stiff the kids couldn't turn on the water.
Electrical Companies in Christchurch (halkettelectrical.co.nz)
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Need help identifying type of 240 wires
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