Here’s a sure red flag the home contractor you’re considering is untrustworthy | 25 Amp Circuit Breaker

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110/220 is the load rating and 120/240 is what the circuit provides. The voltage could sag as low as 110 or 220 in use.

Varistors primarily consist of arrays of zinc-oxide (ZnO) balls, in which the ZnO was altered with small amounts of other metal oxides such as bismuth, cobalt, or manganese. In the MOV manufacturing process, these balls are sintered (fused) into a ceramic semiconductor. This produces a crystalline microstructure that allows these devices to dissipate very high levels of transient energy across their entire bulk. After sintering, the surface is metallized, and leads are attached via soldering.

During service calls, being able to identify undersized conductors can help resolve compressor start issues or intermittent trips of breakers or fuses. Knowing appropriate and inappropriate breaker and conductor sizes will save you and your customers time and money.

my first “real” job was in a video game arcade back in the 80’s my boss was a really cheap prick that used to buy asian cocktail machines that were “native” 110V, with a 240V to 110V step down transformer wedged in where it would fit, my second day I was fishing out a 20 cent coin that had missed the coin box, I got “zapped” hard enough to blow my finger nail in half and stop my heart.

If you have a 3D-capable Sony television to view them on, capturing 3D images can definitely be entertaining. That’s about where I’d leave it, though: "Entertaining" vs "compelling." While you do get a reasonable 3D effect in shots captured this way, I found the quality of the 3D experience a little disappointing. Don’t expect Avatar-level 3D, this strikes me as more of a gee-whiz sort of feature: In my experience, the 3D effect is a bit limited, and foreground objects tend to break up visually. I suspect this has to do with the fact that the perspective is changing throughout the sweep, so things like effective intraocular distance and viewing angle aren’t perfectly consistent throughout the image. Whatever the cause, it’s a fun effect, but not something that would be a decisive factor for me in choosing a camera, whereas ordinary 2D sweep panorama is something that I’ve used often. (Personally, I suspect this feature has a lot less to do with selling cameras than it does with selling TVs: I wouldn’t buy a camera for the feature, but all else being equal, if I owned a Sony camera that had the feature, I’d be more inclined to purchase a Sony television that supported it.)

The nostalgia for “classic” miniature consoles isn’t ending anytime soon, either: Sony just announced today it’s making its own PlayStation Classic console. The tiny PS1 will come with “20 genre-defining titles,” and it’s set to release this December for $99.99. Also coming this winter is the Sega Mega Drive collection on the Nintendo Switch, and the trailer for it was published today.

This is a heater that’s going to be near fingers, or elbows, and is completely accessible to them, completely easy to touch. One day, when he’s distracted thinking about something else (not rare), he’ll end up touching the heater and getting a shock.

DC burns. It doesn’t cause a muscle lock-up like AC does. It’s more dangerous in that sense, because you don’t feel it beyond the initial shock until your flesh starts to cook from inside out.

> those who haven had the opportunity to study electricity or had made the effort to study it. Can’t let Darwin wipe them out when they happens to the target market… Even worse is that there are people that want to build printers on their own, but are not qualified to wire stuff to line voltage safely.

Invensys Triconex: 冗余容错控制系统、基于三重模件冗余（TMR）结构的最现代化的容错控制器。

Simple, do you know how expensive it would be to change from 120v to 240v? It would be an insane amount and there would be virtually no benefit.