system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:Why do items that can hold charge like mobile phones take time to gain charge? isn't electricity extremely fast?
gpt
Electricity can be extremely fast, but in this case there is an electrochemical reaction going on, which is not that fast.  Also, the faster they go, the more heat they produce, which can be dangerous.

Incidentally, if you charge your phone using a wall charger, it will usually charge faster than plugging it into a computer.