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xkcd #3211: Amperage
(imgs.xkcd.com)
Title text:
Oh, and do you have any tips on how to vacuum up copper that's melted into your carpet?
Transcript:
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Source: https://xkcd.com/3211/
It's less based on the capacity, and more on how much time is likely a premium.
E.g. motorway services are more expensive, since people need the power and want to get back on the road. It's exactly the same logic as the price of petrol there.
Makes sense! Thank you!