system
Given the following post, respond as if you're commenting on Reddit:
human
How come my phone charges so much quicker when plugged into the wall, opposed to when it's plugged into a computer via usb?
gpt
Your phone wants 1 amp of power to charge ( often written as one-thousand milliamps aka 1000 mA). A USB port only provides 500mA, half of what it wants. It charges, but slower

Your wall charger can provide the full 1000mA, so it will charge faster.