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My car charger can boil water really fast [video]

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77 points zdw | 2 comments | 28 Nov 25 02:58 UTC | HN request time: 0s | source
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JonChesterfield ◴[07 Dec 25 13:21 UTC] No.46181494[source]▶
I'm sure there was a period where one couldn't find a 3kW kettle in the UK on power efficiency grounds, one was supposed to run a 2kW one instead to save the planet. But now when I search I find 3kW models again. So either that was a nightmare of some sort or sanity has prevailed.

Chatgpt thinks this was threatened in 2010 then postponed in 2016 then cancelled, which vaguely aligns with my timeline of interest in tea.

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1. quickthrowman ◴[07 Dec 25 14:14 UTC] No.46181811[source]▶
A larger heating element is very slightly more efficient due to less heat escaping as the liquid is heated more quickly. Resistive electric heating is always 100% efficient no matter the size of the heating element.

Keep in mind that heat is constantly being transferred between things that are different temperatures, the faster something reaches the set point temperature, the less time there is to lose heat.

https://en.wikipedia.org/wiki/Heat_equation

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2. maccard ◴[07 Dec 25 16:51 UTC] No.46183076[source]▶
If we really cared about efficiency of these devices, they'd be insulated.