When locked in the vault, Spider-Man with the help of Karen uses his calculator to open the door, how did he do that?
Peter Parker was either using the calculator to try and short circuit the system or calculate the options. For the short circuit aspect it would increase the voltage to override the max electricity used causing it to blow out and open the door hence why he said "up the voltage". But on the other hand he might have been using the calculator for its basic use and do math. He would have been calculating what he needs to do to open the door. Hope this helps, thanks.