It’s not a trick question: You can make a battery out of concrete by storing gravitational potential energy.
https://media.wired.com/photos/5b7de57d5560bb1fedf11d35/master/pass/waterdrums-837113330.jpg
It’s not a trick question: You can make a battery out of concrete by storing gravitational potential energy.
https://media.wired.com/photos/5b7de57d5560bb1fedf11d35/master/pass/waterdrums-837113330.jpg