New Google Classroom update makes it harder to cheat on quizzes | Lrd12 Overload Relay

With a smart charger the EV can be recharged at night and unless you are using electric strip heaters, even a 100 amp service panel can suffice. From 10 pm to 6 am there is no significant electrical demand (only the fridge or the furnace motor) to compete with the 32 amps for the EV. A drawback to L1 charging is having to leave the car plugged in for 3 times as long and having a power cord to trip over in the garage.

Then again, like other counterfeit assemblies…. they might rely on the installer using a 25A relay for a 15A load which is why they put a counterfeit 16A triac inside which the manufacturer actually put a die of a 12A because he knows his user will de-rate the max current anyway.

This is an important enough point that I felt it deserved its own heading: High speed shooting isn’t just about sports photography; it’s about capturing the perfect moment, regardless of how fast the subject is moving. This is a point I’ve been making since I first tested a prototype of the Casio FH20 a couple of years ago: The difference between the perfect moment of blowing out the birthday candles and one that’s a near miss can be a small fraction of a second. When shooting candids of people chatting and interacting, facial expressions and mouth positions change in literally the blink of an eye. A camera that shoots at 7 frames per second vs. one that only manages 3 frames per second can mean the difference between dozens of "keepers" and just a few.

And now you know why companies react the way they do. It would be like someone going around deliberately ruining your reputation, and there’s little you could do about it.

Thanks again to the relatively short stature of the Sony A33, the remainder of the rear-panel controls are rather difficult to reach when shooting single-handed, even with the relatively light kit lens attached. There are only a few buttons, Function, Playback, and Delete, plus a four-way controller with a central OK button. This isn’t an issue if shooting two-handed, but you do have to change your grip fairly substantially to reach any further than the top quadrant of the four-way controller. With real-estate at a premium, Sony has only provided markings on the controller for the alternate functions offered during shooting (and in the case of the Up / Display button, during playback).

Operating temperatures are another consideration. Assume the ambient operating temperature for this application ranged from 0 to +70°C. This would be within the MOV’s -40 to +85°C rating, and there would be no requirement for derating of surge current or energy across this temperature range.Taking high-line tolerance into account, a 275-V ac-rated MOV may be chosen for this example. Using a 2-hp, single-phase, medium-sized motor, the MOV’s required surge-current rating would be determined by the peak current induced at the motor supply. Assuming a service location for the motor and a line impedance of 2 Ω, it was determined that a 3-kA lightning surge was possible. In this case, one datasheet indicates a maximum clamping voltage of 3 kA at 900 V, which is below the 918-V suggested stator-winding withstand capability. If the motor’s operational life were estimated to be 20 years and specified as being able to withstand 80 lightning transients during term of service, the datasheet pulse-rating curves would verify a rating of 100+ surges.

Even if you have 20A circuit breakers, 15A is going to likely be the circuit limit because most heavy-duty extension cords you can get are only rated for 15A – which, again, means charging at 12A.

Of course, after buying a 1000W PSU, I kept getting intermittent shutdowns and freezes after 30-60 minutes of gameplay or CAD work, despite remaining perfectly stable while mining for days at a time. The GTX670 has no backplate and last year a fan screw vibrated loose and fell on top of it while everything was running. The motherboard was toast so I ungraded it and the CPU (AMD FX9590), but the GTX670 itself seemed okay. Apparently not.

The Death Star post illustrates why we shouldn’t let economists decide how to run things. That and a million other stories from real life.

Of course you can use an extra 50Hz transformer, you do not need voltage regulation. But you need power (DC) for motors and electronics. If you have already a switching PSU (which are often even cheaper than big heavy iron/copper transformers of the same power) the extra power capability for the heater does not cost very much. Lets say you will not get the 120VA transformer for the price difference of lets say a 80W PSU vs. a 200W PSU. Also you can switch the DC with a single MOSFET.

Continuing USWaterRockets: PCB could just have the solder mask on, mostly for oxidation/contamination protection, with the heating element trace a single top layer. Put a plate of borosilicate glass (maybe tempered?) tightly over it to spread heat and protect from shock, with overhang on the hazard side. If you want to get fancy, add an “active” indicator LED and a few thermal sensors on the bottom layer. Mind your PCB glass mat material and construction – make sure that the construction can handle the heat (a good [not great, not cheap] construction can handle ~170C before it reaches glass transition temperature)

Styling of the Niro is barely distinguishable from the standard car, save the door covering the charge port and subtle teal accents inside and out that indicate to the outside world that this is slightly more eco than everything else. And those eco signifiers tend to be either green or blue, so why not blend them into Nineties-Fantastic Teal?