Residential power in the US is universally (to the best of my knowledge) three pole single phase 60 Hz 240V. The (common) wall outlets are certainly 120V, but large appliances are 240V. (A typical electric dryer is ~5kW at just over 20A.)
As long as I'm ackchyuallying, I'll also point out that radiant cooktops don't have LEDs in them (at least I've never come across one like that). The red light (which I assume you're referring to) is just what happens when the element in an infrared heater (space heater, toaster, etc) gets hot.
Parent is writing about induction, not radiant. In either case, they usually have additional indicator of residual heat after the heater is turned off. But yes, that's likely not a LED either.
Re:We need physical audio kill switches
by vel0city on Monday September 21, 2020 @03:50PM
(#24547671)
A cooktop in the US would be using 240V single-phase power. 7,000W / 240V = 29.167A.
Three legs come into the house, two hots and center tap neutral. Either hot to the neutral = 120V. Either hot to the other hot = 240V.
OTOH, leaving a plastic (PP or some other thermoplastic) board on non-induction glass heater top would smear in a horrific way, close to impossible to clear it. The heaters do have LED illumination, though.