New Google Classroom update makes it harder to cheat on quizzes | 220v Contactor Relay

Norm, remember your high school electrical classes, and don’t confuse the young ‘uns here. I’m sure you’ll recall that halving the current reduces losses (heating) in a conductor to one quarter: losses are proportional to the square of the current.

I think that’s technically just thin graphite. Graphene is 1 molecule thick sheets. People were gobsmacked when they discovered you could make it with sellotape.

For the voltage setting, I thought that wattage equaled volts times amps? Shouldn’t the waste heat be the same regardless of whether it’s drawing ten amps at 120 or five amps at 240? Or is it more complex and nonlinear than that? I’m curious.

Many lawmakers see this legislation as increasingly more crucial in the wake of Attorney General Jeff Sessions’s departure and Trump’s ongoing critiques of the Mueller probe.

Reading at least the related article and a datasheet before making comments about something is quite a heavy task to ask this days…

For something like this I would go to a proper electrical supplier and probably would use an AC contactor relay that’s rated twice the current. Sure a contactor needs a 24V transformer but it’s a small price to pay and the current use would be insignificant compared the the hot water heater.

Electrical installations in Northern States are much more insulated from the weather than those of you in warm climates, so the typical installations for car charging are almost never $300.

On top of this, if we halve the current, then we can also use thinner and therefor cheaper wires in our power distribution system.

Sometimes you’ll get a zap across your hand, maybe even a horrible burn. But I like those odds compared to you touched live and it routed current through your heart!

That depends on the country. I live in Europe, and people here are allowed to do basic repairs and modification with mains voltage, like adding extra outlets. All the materials such as PVC conduits, wires, outlets, lights, switches and dimmers are readily available in the hardware store. It is however not allowed to mess with anything before the meter or fuses. Some equipment like electric stoves don’t come with power cords. Instead, you open up some compartment, and attach the wires on some screw terminals.

Coastal BC might be viable for them, here in the “temperate” bit of Ontario they’d be good in April and October.

Yup, switched off but still plugged in, that way the case is still earthed. Assuming a sensible 3-pin plug, or whatever the hell they do in places with just 2.