The buyer’s guide to electric-car charging stations | 25 Amp Circuit Breaker

This makes no sense when you’re designing a heater. The higher the current, the hotter the wire will be. That’s why power companies transmit power at high voltage in the first place: they want to minimize heating. 120 watts flowing through a wire does NOT mean that 120 watts of heat are dissipated in it. You’ll get a much more efficient heater at lower voltages and higher currents.

For example, putting 1 mA through a 1 MOhm resistor requires 1000 Volts. The current itself is barely noticeable and if it’s high frequency current you’re unlikely to feel pain – it’s just a funny spark that kinda tickles at your fingertip – but it’s still depositing 1 Watts of power into the resistance.

Built by creative agency redpepper, There’s Waldo zeroes in and finds Waldo with a sniper-like accuracy. The metal robotic arm is a Raspberry Pi-controlled uArm Swift Pro which is equipped with a Vision Camera Kit that allows for facial recognition. The camera takes a photo of the page, which then uses OpenCV to find the possible Waldo faces in the photo. The faces are then sent to be analyzed by Google’s AutoML Vision service, which has been trained on photos of Waldo. If the robot determines a match with 95 percent confidence or higher, it’ll point to all the Waldos it can find on the page.

I don’t know where your grid is, but in North America, high voltage lines are not 100 kV. 19 kV and 69 kV are typical for local distribution. 115 or 138 kV for intra-city, and 230 or 500 kV for most long-haul lines, not counting the whacky HVDC or EHV stuff.

GFCI breakers aren’t usually used because they aren’t accessible to normal operators like a outlet mounted one would be.

Varistors, also called metal-oxide varistors (MOVs), are used to protect sensitive circuits from a variety of overvoltage conditions. Essentially, these voltage-dependent, nonlinear devices have electrical characteristics similar to back-to- back Zener diodes.

MOVs tend to degrade gradually after a large surge or multiple small surges. This degradation leads to increasing MOV leakage current; in turn, this raises the MOV’s temperature, even under normal conditions such as a 120-V ac or 240-V ac operating voltage. A thermal disconnect adjacent to the MOV (Fig. 4) can be used to sense the increase in MOV temperature while it continues to degrade to its end-of-life condition. At this point, the thermal disconnect will open the circuit, removing the degraded MOV from the circuit and thus preventing potential catastrophic failure.

WIRE CONTACTOR: A wire and contactor displaying the 90°C rating on the wire and 75°C rating on the contactor (when properly torqued).

The farther I need to travel to get to you, the more time is taken out of my day—and I’ll factor that into your bill. Finding someone closer to your neighborhood might be able to charge you less.

It’s been a week and I am almost constantly having to keep the car charging while at home just to keep up. On my previous L2, I charged every 2 to 3 days. My first problem was the outlet closest to the driveway shares the circuit with the family room. Oops, popping the breaker every time. The front of the house outlet wasn’t any better. Luckily there is a basement outlet I can drive to and get a charge with no issues.

How about trying to say something accurate for a change? Almost everything you say lately is provably WRONG.

For all my complaining about the difficulty of tracking sports subjects and the dead-screen issue, though, the difference between these SLTs and other consumer-level DSLRs is little short of astonishing. It may not be a direct substitute for a Canon 1D Mark IV or Nikon D3s, but if you have a budget of under $1,000 and shoot any fast action at all, the Sony A55 and A33 are hands-down slam-dunk purchase decisions. At this point, there’s nothing else in the large-sensor segment of the digital camera market that remotely approaches their high-speed capture capabilities.