Who’s really being silenced on Twitter? | 19mm Momentary Push Button

(So your distribution wire can be thinner, and so cheaper, mainly because you have less current, but also because you can have a slightly higher voltage drop with less consequence !)

At the end of the day all power supplies deserve respect, not least because they’re more likely to kill you by burning your house down than through electrocution.

Experts suggest buying an EVSE that can produce at least 30 amps of power. Generally speaking this type of unit would be able to add around 30 miles of operating range to a given battery pack per hour. Some EVs can get along with fewer amps, but buying more capability than you may need today makes the installation “future proof” should you eventually trade in the vehicle for a model that can handle the added capacity. However, if you’re planning on using a 30-amp unit you may need to upgrade the line’s circuit breaker to one that’s rated for at least 40 amps.

can’t be said too many times: foteks are known to roll over, fart and let the smoke out. doesn’t hurt to overspec by 3-5. not when playing with fire.

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.

Probably doesn’t completely answer your question, but you might like to watch this for more info about RCD/RCBOs and how they operate. It contains some very entertaining explosions. }:~)

That’s also a mistake in the article, because the house ground doesn’t exactly ground the house. It just grounds the appliances. You can still have thousands of volts between a table and the wall socket ground in a thunderstorm. Even on a normal day, you have about 100 Volts per meter in potential difference just from atmospheric charges, which is why it’s a bad idea to ground the computer you’re working on unless you also ground the table, the chair, the floor and yourself.

You need to factor in the kWh you used within the week (along with the cost per kWh). This will give people a better idea of actual cost to power this vehicle 253 miles.

The RF-controlled remote switch appliances that can be found for a few dollars are self-contained, I would think that a Wifi-based one could also be?

Two inputs for the beefy converter are supplied from outlets not just on separate circuits, but on two circuits whose hot lines are 180 degrees out of phase. That means identifying where there are two plugs, not protected by GFCI outlets or breakers, which are on two separate hot lines of split phase power. To protect the user, [Nick] designed in a set of relays which kill the circuit when one of the two supplies is unplugged. A system that didn’t have these protections would have mains voltage on the prongs of the disconnected plug.

It’s not easy to get that many amp-turns out of such a feeble source. You can wind arbitrarily many turns in a coil and create ridiculous magnetic fields, but the series resistance grows to the point that adding more turns decreases the current and diminishes the field.

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