inverter to charge laptop

I don't really understand the difference ...?
Plus then I have the fag of ensuring compatability?
and couldn't I then use inverter for other thng?

(flipping losigltters again)
an inverter takes 12v dc & steps it up to 240 ac you then use your lappi charger that steps the 240ac down to say 19v dc.
very wasteful with all those losses
 
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