Does “electricty” or whatever it’s called that goes into your electric vehicle battery, have mass or weigh anything? My car has a 100KW battery. Is the weight substantially different when it has 0 charge versus when it is fully charged? It seems like a lot of energy goes into the battery, it must add to the net mass of the vehicle?
In: Technology
Yes It does. Charged batteries have more electrons in them then discharged and electrons weigh something.
Plus there is the fundamental concept E=mc^2. A full battery has an amount of extra energy and thus an amount of extra mass.
A single electron volt weights 1.8 * 10^-36 Kg. There’s 2.25 * 10^25 in a kw.
Assuming the car battery is 100 KW/h (100KW is not a storage quantity), then you end up with 0.00405 milligrams. Which is probably the weight of a short enough human hair.
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