120V US electric user here. I use an electric kettle, I just checked and it= is rated 1200W. From theory it should take about 7 minutes to bring about = a quart of water up to a boil, which matches my experience of starting it, = walking away, and coming back 10 minutes later to find it finished. > On Mar 22, 2019, at 12:55 PM, Isaac M. Bavaresco wrote: >=20 > I think the most efficient way of heating water ought be an electric heat= er > dipped in the water in a *very* well thermally insulated pot. >=20 > Almost all inefficiencies play in our favor, the only possible losses wou= ld > be some EM and phonon emissions, besides the thermal conductivity of the > pot's walls. >=20 > Even a microwave oven oughta waste more energy. >=20 > Cheers, > Isaac >=20 >=20 > Em sex, 22 de mar de 2019 13:07, Bob Blick escreve= u: >=20 >> I think it depends on how you heat the water. Electric stoves run on 240 >> volts, so if you put a tea kettle on the stove it's pretty much the same= .. >> Electric tea kettles that plug into 120 volt outlets are a rarity here. = I >> mostly use a microwave if I'm making a cup of tea, and it does take a wh= ile >> to bring the water to a boil. >>=20 >> Bob >>=20 >> ________________________________________ >> From: piclist-bounces@mit.edu on behalf of >> James Cameron >> Sent: Friday, March 22, 2019 3:04 AM >> To: Microcontroller discussion list - Public. >> Subject: Re: [OT] Solar Power >>=20 >> On Thu, Mar 21, 2019 at 08:45:27PM +1300, RussellMc wrote: >>> [...] >>> http://www.inference.org.uk/sustainable/book/tex/sewtha.pdf >>=20 >> A side issue. >>=20 >> On the 63rd page, marked page 50, it is said that "In countries where >> the voltage is 110 volts, it takes twice as long to make a pot of >> tea." >>=20 >> In UK, it is said that a 230V outlet permits up to 13A. So the >> limit is 2.990kW. >>=20 >> In Australia, a 240V outlet permits up to 10A. So the limit is 2.4kW. >>=20 >> What does the US have as a conventional pluggable cable limit? >> Wikipedia suggests 115V and 15A, or 1.725 kW for NEMA 1-15 or 5-15. >>=20 >> So that is 58% of the UK tea power delivery. >>=20 >> Or 1.73 times as long? >>=20 >> -- >> James Cameron >> http://quozl.netrek.org/ >> -- --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .