25 things to do before Aug. 25 – Edinboro University News Detail | 25 Amp Circuit Breaker

Some customers get sticker shock, but I’m not trying to rip you off. You only see the half-hour of work I did in your home, but that’s not the whole story. I spent years training, and now I need to pay my crew (who went out of their way to get to your home), plus deal with marketing and other costs of running a business—and my prices reflect that. Learn 11 more secrets contractors wish homeowners knew.

not exactly mains but when i was a kid i enjoyed playing with photoflash caps and at one point had one fully charged to about 330V and discovered the negative post to the AA battery was also connected to the cap and put the entire shot up one arm, across my damn heart and out the other arm, my whole body locked up for only about a second (maybe 2) and i think i fell over (like people in taser videos but i was sitting). it sure shook me up and im glad it was only a small cap

I am going to try a rheostat on the input voltage to see if I can drop the rectifier output voltage to around 30v. Right now it works but will pop a15A wall circuit breaker after 15-20 seconds. But it is a super strong magnet. Limiting the current is the key I believe. More later

Earthing is thus a vital part of power distribution safety. The only snag with open equipment on your bench is that any earth connection becomes a valid part of the return circuit for the power, and since that earth connection can come through you, that’s dangerous. The isolating transformer breaks that earth circuit for your bench, thus removing that particular hazard. The upshot of this is that you can safely touch either one of the two wires and because there’s no path to ground, you won’t get zapped. (Touching two wires completes the circuit. You still have to be careful!) Isolation transformers are also used to lift the ground so that you can connect mains circuitry up to your oscilloscope, even though the black probe clip is connected to earth ground.

Yes, I know that I’m just offloading my energy use to my residential electric service (which is, around here at least, produced mostly by coal or natural gas). Let’s leave that discussion for somewhere else. The impact at the fuel pump is what matters here. Spending eight dollars or less every week to drive to and from the cube farm is incredibly appealing.

Rob, where would anyone ever get 10,000V from? Or even 1,000? Short of lightning strikes, these voltages don’t exist in the home, or in many factories. Why do those voltages matter?

And if your primary and secondary are of different wire gauges, the thinner one becomes your limiting current factor. Wired in parallel gives the same ampere-turn count, but with less resistance, possible more AMPeres, so more aoere-turns.

This causes some headaches for a friend who has to deal with unaware contractors installing 240VAC or 220 VAC devices in condo kitchens what have 208VAC, not 240VAC. Some devices don’t work, some don’t work well.

From the top of the Sony Alpha A33 camera body, you can just see the stereo microphones, located on either side of the flash hot shoe on the sides of the viewfinder / popup flash housing, as well as the three hole grille the speaker (above the Finder/LCD button). At the top of the handgrip is the popular combination of a shutter button surrounded by a power switch, making it easy to quickly power on the camera and snap a picture with one finger. The Finder / LCD button allows the A33 to be manually switched between shooting with the electronic viewfinder or the rear LCD panel. Upper right of this is a D-Range button that provides access to Dynamic Range Optimizer and High Dynamic Range shooting options.

Even if a business without a license can charge you less, it’s worth looking for a licensed electrician like me. Most states require professional electricians to be licensed, so a person without one is a red flag. He or she might not have insurance and could stop picking up the phone if something goes wrong. As a licensed electrician, I will be held accountable—which is good news for my customers. Check out these other 35 things every homeowner needs to know.

Creating a PCB heat bed isn’t an art – it’s a science. There are equations and variables to calculate, possibly some empirical measurements by measuring the resistance of a trace, but Ohm’s Law is a law for a reason. If you do things right, you can make a PCB heat bed perfectly suited for the task. You can even design in safety features like overcurrent protection and fuses. It can’t be that hard. After all, your house is full of devices that are plugged into the wall.

You say dull, I say perfectly judged for the day to day. This plus a sports car for the weekend would be a very nice combo.