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The quickest way to get good at this is practice.

Just ask engineer friends random questions from time to time, and when there is no consensus, calculate the results properly.

Eg. How much power could a solar powered fly collect?

How many tons of batteries would I need to drive a train across the USA?

How long can I power my laptop from a solar usb battery bank in the sun each day on a hiking trip?

What's the load time of this webpage I just wrote on a satellite internet connection?

How long would it take to boot up my OS if I could keep RAM intact during a reboot?

How many kilos of coal does it take to cook a pizza?



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