system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How does fast charging work compared to regular charging?

When I got my phone it came with a fast charger. I think it takes about 2 hours to charge if I used the charging base that came with it, whereas if I use another base that doesn't use fast charging, it takes much longer to charge.

How does fast charging work and why is it faster than regular charging?
gpt
Power = current x voltage.  

Fast chargers can increase the current or voltage.  

If you read the label on your power connector itll say something like 2A/5V, or 2A/19V.   So the 2a/19V charges faster.

When you plug in a cable the phone and power adapter negotiate what speed to charge at.