No high school diploma? You’ve got options! | 25 Amp Circuit Breaker

There are lots of AC coils out there – in my parts bins I have AC driven relays, and AC solenoid valves. How do they work?

Before we dig in, know that the Amazon Smart Plug is designed for use with a 100-120 volt three prong system so it’s a North American product only.

I will not put all the money on the bet, but this one might be indeed one of the solutions: http://www.mouser.com/ds/2/328/lnk302_304-306-179954.pdf if you want something “all-in-one”. I prefer a separate external PSU for many reasons, including circuit separation and protection. You can find 5V and 3.3V SMPS DIN rail mouting ones for decent prices.

WASHOUGAL — To hear Shirley Scott tell it, this town’s recent drive toward proliferating public artworks was born out of…

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.

And here I am telling the tale, one reason I snort whenever the momma’s kiddies post their “safety warning” comments on HaD.

In the case of Chinese relays and SSRs I double the amps and add 10% …. Ditto for Chinese switching regulators which put out everything but DC after they reach about 50-60% of their rated load

80%? When dealing with high current loads I top at 70% to allow for wobble of line voltage. For something like a Water heater I’d drop that to 50% ratings to make sure the surge doesn’t cause failure.

However there is a snag. In recent years there has been a flood of cheaper instruments arriving on the market, and some of the manufacturers of these devices have been found to put IEC 61010 ratings fraudulently on items which do not in any way meet those standards. We have covered tales of dodgy cheap multimeters and test failures more than once here at Hackaday, unfortunately this is a widespread problem. So please bear this in mind when buying a multimeter or other instrument for use with mains voltages: the cheapest may not be good enough. We have all used £5/$10 bargain meters with our low-voltage analogue or microcontroller work because a flashing LED on a breadboard is hardly hazardous, however for higher voltages those IEC class markings have to come with a believable provenance. Buy the most expensive instrument you can afford from a decent and reputable manufacturer, it’ll keep you safer and you’ll get a top-quality meter that will last you a lifetime.

Just took a few seconds? the speed of light must be a bit slower in whatever dimension you’re living in.

I’ve used 220V heaters to cook meat and I survived (quite well fed) up until now. I suppose heating a piece of plastic can’t be that much more difficult, although wh

http://www.canadiantire.ca/en/automotive/interior-auto-accessories/winter-accessories/automotive-accessories/polar-pad-engine-heater-125w-0300004p.html