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You also have cables running from the power distribution system and over to the servers, if we halve the current in these lines, then we quarter the power dissipation in these cables. This is both true for the power cords, and for the internals in the power supply as well. At least for the “AC” side of it.

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Pools have come a long way. It used to be you had a pump and if you were lucky it had a mechanical timer switch on it. That was it. Now you have digital controllers and spa jets and heaters. You can even get them that connect to your home automation system. If your pool isn’t new enough to do that already, you can get a range of add-on accessories. For a price. [Rob] paid $500 to get a remote for his pool. It wasn’t even WiFi, just a simple RF remote. In 3 years, the transmitter had burned out ($300 to replace) and he decided he had enough. For $20, [Rob] added MQTT control and monitoring to his pool using an ESP8266. You can see the video description of the project below.

Hopefully the era when people did industrial sourcing from an overgrown Beanie Baby marketplace will be looked back on by future generations, and they’ll laugh.

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.

I’m wondering why nobody is simply rectifying a 120vac input for dc wiring the secondary coil? It means you don’t have to swap the coil location or use a dc power supply. I have a trans with a secondary resistance of 82ohms. Putting 120vdc through it would be about 175watts (assuming I do a good job of determining wire size and 1.46amps is ok)

You need to learn how to read a datasheet and understand the terms – without an understanding it won’t do you any good.

Keep in mind that extension cords running from a generator can power anything that plugs into a wall socket, but not hard-wired appliances such as a furnace, sump pump or central air conditioner. If you want to run any of those during an outage, you will need to have a licensed electrician install a manual transfer switch (it looks like a mini circuit breaker) next to your main electrical panel. A heavy-duty cord from the generator plugs into the switch and allows you to power select circuits in your home. Prices vary depending on your market. In Neale’s case, she paid about $1,200 for the switch and installation, more than for the generator, which cost about $550.

I can only think of a single instance in the last six months where the HPWC higher charge rate would have made a difference for us, and even then it would have simply made leaving for a long trip slightly more comfortable.

I know this goes against what many of you have been told and understood your entire career, but take a deep breath and read on.

I once started cutting into a wall which the building super assured me had no utilities in it with an old sawzall with the ground pin cut off, woke up on the floor with the saw still going in my hands. I hit a live natural gas pipe but the bad ground knocked me down before I could sever gas pipe and destroy the building, kind of like the freak accident where you get thrown clear since you weren’t wearing a seatbelt and walk away from an otherwise deadly crash. I don’t recommend using ungrounded tools but don’t take anyone’s word, verify yourself!

These were obviously mistakes. I would never intentionally come into contact with HT from the anode cap.