Answer:
Functions can be useful for many reasons, it is one of the main components to learn in writing code. Without functions code would not be where it is today.
Explanation:
Primary because it is non-volatile storage
This is normal as personal computers, unless designed to, don't usually put out a ton of power it's mostly just what your battery need and a bit more that's it
Well think of it like this lets say this wasn't and security system and it was a video game console and remote.
Now the console or keypad or the main components the power on or shut off the devices and the remote or sensors are the secondary parts but they are needed to help the console or keypad figure out what they are doing.
