Update: I am actually searching for really simple, intuitive ways to explain it. I have a background in engineering, but am struggling to explain why we “pay for kwh”, and not kw (on our electricity bill) to someone who doesn’t. I have tried in many ways but maybe I’m not giving the right examples or making the right comparisons. I am really searchig for a way to ELI5.
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It’s rate vs. amount. You have to maintain a rate over a period of time to achieve something.
As an example use traveling in a car. Rate would be equivalent to speed say 60 mph. But it’s only by going 60mph for a while that you get somewhere. Say you’ve travelled 60 miles, you have to maintain 60mph for an hour to get there (amount). Let’s say I hop in a cab and want to go somewhere. If I paid by rate he/she could simply accelerate to 60mph and then stop and ask for money. When I get in a cab I want to go somewhere so I am paying for he/she to maintain a rate over a period of time to actually cover the distance desired.
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